NOAA SWPC Alertes, surveillances et avertissements

Le Centre de prévision National Oceanic and Atmospheric Administration Space Weather (NOAA SWPC) est l'organisme gouvernemental de la météorologie spatiale officielle des États-Unis qui fournit des alertes pour les perturbations de la météo spatiale. Ci-dessous vous trouverez les dernières alertes météorologiques de l'espace émis par la NOAA SWPC.

mardi, 17 septembre 2024

08:21 UTC

Space Weather Message Code: ALTK05
Serial Number: 1645
Issue Time: 2024 Sep 17 0821 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 17 0816 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

07:52 UTC

Space Weather Message Code: ALTPX1
Serial Number: 351
Issue Time: 2024 Sep 17 0752 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Sep 17 0735 UTC
NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

05:21 UTC

Space Weather Message Code: WARPX1
Serial Number: 576
Issue Time: 2024 Sep 17 0521 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2024 Sep 17 0521 UTC
Valid To: 2024 Sep 17 2359 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

04:35 UTC

Space Weather Message Code: ALTK07
Serial Number: 167
Issue Time: 2024 Sep 17 0435 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2024 Sep 17 0426 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

03:53 UTC

Space Weather Message Code: ALTK06
Serial Number: 596
Issue Time: 2024 Sep 17 0353 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 17 0346 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

03:31 UTC

Space Weather Message Code: ALTK05
Serial Number: 1644
Issue Time: 2024 Sep 17 0331 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 17 0331 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

03:00 UTC

Space Weather Message Code: ALTK08
Serial Number: 42
Issue Time: 2024 Sep 17 0300 UTC

ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2024 Sep 17 0257 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G4 - Severe

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.

01:28 UTC

Space Weather Message Code: ALTK07
Serial Number: 166
Issue Time: 2024 Sep 17 0128 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2024 Sep 17 0127 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

01:18 UTC

Space Weather Message Code: WARK07
Serial Number: 116
Issue Time: 2024 Sep 17 0118 UTC

WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2024 Sep 17 0120 UTC
Valid To: 2024 Sep 17 1200 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

01:14 UTC

Space Weather Message Code: ALTK06
Serial Number: 595
Issue Time: 2024 Sep 17 0114 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 17 0113 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

01:05 UTC

Space Weather Message Code: ALTK05
Serial Number: 1643
Issue Time: 2024 Sep 17 0105 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 17 0103 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:05 UTC

Space Weather Message Code: WARK06
Serial Number: 544
Issue Time: 2024 Sep 17 0105 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Sep 17 0105 UTC
Valid To: 2024 Sep 17 1200 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

lundi, 16 septembre 2024

23:41 UTC

Space Weather Message Code: SUMSUD
Serial Number: 279
Issue Time: 2024 Sep 16 2341 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2024 Sep 16 2329 UTC
Deviation: 39 nT
Station: BOU

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

23:32 UTC

Space Weather Message Code: WARK04
Serial Number: 4698
Issue Time: 2024 Sep 16 2332 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4697
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 17 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

23:32 UTC

Space Weather Message Code: WARK05
Serial Number: 1929
Issue Time: 2024 Sep 16 2332 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Sep 16 2335 UTC
Valid To: 2024 Sep 17 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

23:02 UTC

Space Weather Message Code: WARSUD
Serial Number: 235
Issue Time: 2024 Sep 16 2302 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2024 Sep 16 2310 UTC
Valid To: 2024 Sep 17 0010 UTC
IP Shock Passage Observed: 2024 Sep 16 2249 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

14:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4697
Issue Time: 2024 Sep 16 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4696
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 17 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:28 UTC

Space Weather Message Code: WARK05
Serial Number: 1927
Issue Time: 2024 Sep 16 1028 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Sep 16 1028 UTC
Valid To: 2024 Sep 16 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

10:16 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3401
Issue Time: 2024 Sep 16 1016 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3400
Begin Time: 2024 Sep 15 1215 UTC
Yesterday Maximum 2MeV Flux: 1693 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

08:45 UTC

Space Weather Message Code: WARK04
Serial Number: 4696
Issue Time: 2024 Sep 16 0845 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4695
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 16 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

02:46 UTC

Space Weather Message Code: WARK04
Serial Number: 4695
Issue Time: 2024 Sep 16 0246 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4694
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 16 0900 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

dimanche, 15 septembre 2024

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4694
Issue Time: 2024 Sep 15 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4693
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 16 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

12:30 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3400
Issue Time: 2024 Sep 15 1230 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2024 Sep 15 1215 UTC
Station: GOES16




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

11:27 UTC

Space Weather Message Code: WARK04
Serial Number: 4693
Issue Time: 2024 Sep 15 1127 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4692
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 15 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

samedi, 14 septembre 2024

22:58 UTC

Space Weather Message Code: WARK04
Serial Number: 4692
Issue Time: 2024 Sep 14 2258 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4691
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 15 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

21:04 UTC

Space Weather Message Code: WATA50
Serial Number: 79
Issue Time: 2024 Sep 14 2104 UTC

WATCH: Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Sep 15: None (Below G1) Sep 16: G3 (Strong) Sep 17: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

16:30 UTC

Space Weather Message Code: SUM10R
Serial Number: 836
Issue Time: 2024 Sep 14 1630 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Sep 14 1517 UTC
Maximum Time: 2024 Sep 14 1532 UTC
End Time: 2024 Sep 14 1555 UTC
Duration: 38 minutes
Peak Flux: 1000 sfu
Latest Penticton Noon Flux: 186 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

15:53 UTC

Space Weather Message Code: SUMX01
Serial Number: 172
Issue Time: 2024 Sep 14 1553 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Sep 14 1513 UTC
Maximum Time: 2024 Sep 14 1529 UTC
End Time: 2024 Sep 14 1547 UTC
X-ray Class: X4.5
Optical Class: 2b
Location: S18E62
NOAA Scale: R3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

15:21 UTC

Space Weather Message Code: ALTXMF
Serial Number: 434
Issue Time: 2024 Sep 14 1521 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Sep 14 1518 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

01:33 UTC

Space Weather Message Code: ALTK04
Serial Number: 2473
Issue Time: 2024 Sep 14 0133 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Sep 14 0130 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

vendredi, 13 septembre 2024

22:44 UTC

Space Weather Message Code: ALTK06
Serial Number: 594
Issue Time: 2024 Sep 13 2244 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 13 2244 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

22:41 UTC

Space Weather Message Code: WARK06
Serial Number: 543
Issue Time: 2024 Sep 13 2241 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Sep 13 2240 UTC
Valid To: 2024 Sep 14 1200 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

22:14 UTC

Space Weather Message Code: ALTK05
Serial Number: 1642
Issue Time: 2024 Sep 13 2214 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 13 2213 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

21:59 UTC

Space Weather Message Code: WARK04
Serial Number: 4691
Issue Time: 2024 Sep 13 2159 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4690
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 14 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

21:58 UTC

Space Weather Message Code: WARK05
Serial Number: 1926
Issue Time: 2024 Sep 13 2158 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Sep 13 2158 UTC
Valid To: 2024 Sep 14 2359 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

17:07 UTC

Space Weather Message Code: WATA20
Serial Number: 1012
Issue Time: 2024 Sep 13 1707 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Sep 14: G1 (Minor) Sep 15: None (Below G1) Sep 16: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

17:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3399
Issue Time: 2024 Sep 13 1701 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2024 Sep 13 1645 UTC
Station: GOES16




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

14:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4690
Issue Time: 2024 Sep 13 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4689
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 13 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

07:38 UTC

Space Weather Message Code: SUMXM5
Serial Number: 261
Issue Time: 2024 Sep 13 0738 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Sep 13 0638 UTC
Maximum Time: 2024 Sep 13 0656 UTC
End Time: 2024 Sep 13 0734 UTC
X-ray Class: M5.4
Location: S14W90
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

06:56 UTC

Space Weather Message Code: ALTXMF
Serial Number: 433
Issue Time: 2024 Sep 13 0656 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Sep 13 0652 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

05:29 UTC

Space Weather Message Code: WARK05
Serial Number: 1925
Issue Time: 2024 Sep 13 0529 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1924
Valid From: 2024 Sep 12 0419 UTC
Now Valid Until: 2024 Sep 13 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:28 UTC

Space Weather Message Code: WARK04
Serial Number: 4689
Issue Time: 2024 Sep 13 0528 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4688
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 13 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

05:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1641
Issue Time: 2024 Sep 13 0501 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 13 0456 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

02:30 UTC

Space Weather Message Code: WARK04
Serial Number: 4688
Issue Time: 2024 Sep 13 0230 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4687
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 13 0900 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

02:29 UTC

Space Weather Message Code: WARK05
Serial Number: 1924
Issue Time: 2024 Sep 13 0229 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1923
Valid From: 2024 Sep 12 0419 UTC
Now Valid Until: 2024 Sep 13 0600 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

02:08 UTC

Space Weather Message Code: ALTK05
Serial Number: 1640
Issue Time: 2024 Sep 13 0208 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 13 0201 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

00:41 UTC

Space Weather Message Code: ALTK04
Serial Number: 2472
Issue Time: 2024 Sep 13 0041 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Sep 13 0038 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

jeudi, 12 septembre 2024

23:49 UTC

Space Weather Message Code: ALTK05
Serial Number: 1639
Issue Time: 2024 Sep 12 2349 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 12 2335 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

22:11 UTC

Space Weather Message Code: ALTK04
Serial Number: 2471
Issue Time: 2024 Sep 12 2211 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Sep 12 2208 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

19:53 UTC

Space Weather Message Code: ALTK07
Serial Number: 165
Issue Time: 2024 Sep 12 1953 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2024 Sep 12 1924 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

19:05 UTC

Space Weather Message Code: ALTK06
Serial Number: 593
Issue Time: 2024 Sep 12 1905 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 12 1858 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

18:44 UTC

Space Weather Message Code: ALTK05
Serial Number: 1638
Issue Time: 2024 Sep 12 1844 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 12 1841 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

16:28 UTC

Space Weather Message Code: ALTK06
Serial Number: 592
Issue Time: 2024 Sep 12 1628 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 12 1623 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

15:48 UTC

Space Weather Message Code: ALTK05
Serial Number: 1637
Issue Time: 2024 Sep 12 1548 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 12 1545 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

15:09 UTC

Space Weather Message Code: SUMXM5
Serial Number: 260
Issue Time: 2024 Sep 12 1509 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Sep 12 1431 UTC
Maximum Time: 2024 Sep 12 1443 UTC
End Time: 2024 Sep 12 1447 UTC
X-ray Class: M6.8
Optical Class: na
Location: S15W87
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

14:46 UTC

Space Weather Message Code: ALTK07
Serial Number: 164
Issue Time: 2024 Sep 12 1446 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2024 Sep 12 1443 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

14:45 UTC

Space Weather Message Code: ALTXMF
Serial Number: 432
Issue Time: 2024 Sep 12 1445 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Sep 12 1442 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

13:48 UTC

Space Weather Message Code: ALTK06
Serial Number: 591
Issue Time: 2024 Sep 12 1348 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 12 1344 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

13:33 UTC

Space Weather Message Code: WARK07
Serial Number: 115
Issue Time: 2024 Sep 12 1333 UTC

WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2024 Sep 12 1332 UTC
Valid To: 2024 Sep 12 2100 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

13:24 UTC

Space Weather Message Code: ALTK05
Serial Number: 1636
Issue Time: 2024 Sep 12 1324 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 12 1318 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

13:02 UTC

Space Weather Message Code: WARK06
Serial Number: 542
Issue Time: 2024 Sep 12 1302 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 541
Valid From: 2024 Sep 12 0755 UTC
Now Valid Until: 2024 Sep 12 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

13:02 UTC

Space Weather Message Code: WARK05
Serial Number: 1923
Issue Time: 2024 Sep 12 1302 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1922
Valid From: 2024 Sep 12 0419 UTC
Now Valid Until: 2024 Sep 13 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

13:02 UTC

Space Weather Message Code: WARK04
Serial Number: 4687
Issue Time: 2024 Sep 12 1302 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4686
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 13 0600 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

11:28 UTC

Space Weather Message Code: ALTK06
Serial Number: 590
Issue Time: 2024 Sep 12 1128 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 12 1128 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

10:10 UTC

Space Weather Message Code: ALTK05
Serial Number: 1635
Issue Time: 2024 Sep 12 1010 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 12 1010 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

10:05 UTC

Space Weather Message Code: SUMX01
Serial Number: 171
Issue Time: 2024 Sep 12 1005 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Sep 12 0931 UTC
Maximum Time: 2024 Sep 12 0943 UTC
End Time: 2024 Sep 12 0951 UTC
X-ray Class: X1.3
Location: S16E90
NOAA Scale: R3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

09:56 UTC

Space Weather Message Code: SUM10R
Serial Number: 835
Issue Time: 2024 Sep 12 0956 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Sep 12 0939 UTC
Maximum Time: 2024 Sep 12 0940 UTC
End Time: 2024 Sep 12 0941 UTC
Duration: 2 minutes
Peak Flux: 240 sfu
Latest Penticton Noon Flux: 207 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

09:45 UTC

Space Weather Message Code: ALTXMF
Serial Number: 431
Issue Time: 2024 Sep 12 0945 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Sep 12 0939 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

07:55 UTC

Space Weather Message Code: ALTK05
Serial Number: 1634
Issue Time: 2024 Sep 12 0755 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 12 0754 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

07:55 UTC

Space Weather Message Code: WARK06
Serial Number: 541
Issue Time: 2024 Sep 12 0755 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Sep 12 0755 UTC
Valid To: 2024 Sep 12 1500 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

05:11 UTC

Space Weather Message Code: SUM10R
Serial Number: 834
Issue Time: 2024 Sep 12 0511 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Sep 12 0431 UTC
Maximum Time: 2024 Sep 12 0431 UTC
End Time: 2024 Sep 12 0431 UTC
Duration: 1 minutes
Peak Flux: 230 sfu
Latest Penticton Noon Flux: 207 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

04:19 UTC

Space Weather Message Code: WARK05
Serial Number: 1922
Issue Time: 2024 Sep 12 0419 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Sep 12 0419 UTC
Valid To: 2024 Sep 12 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

04:01 UTC

Space Weather Message Code: SUMSUD
Serial Number: 278
Issue Time: 2024 Sep 12 0401 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2024 Sep 12 0350 UTC
Deviation: 32 nT
Station: CNB

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

03:57 UTC

Space Weather Message Code: ALTK04
Serial Number: 2470
Issue Time: 2024 Sep 12 0357 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Sep 12 0357 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

03:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4686
Issue Time: 2024 Sep 12 0355 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Sep 12 0355 UTC
Valid To: 2024 Sep 12 1800 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

03:15 UTC

Space Weather Message Code: WARSUD
Serial Number: 234
Issue Time: 2024 Sep 12 0315 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2024 Sep 12 0332 UTC
Valid To: 2024 Sep 12 0412 UTC
IP Shock Passage Observed: 2024 Sep 12 0254 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

00:38 UTC

Space Weather Message Code: SUMXM5
Serial Number: 259
Issue Time: 2024 Sep 12 0038 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Sep 11 2349 UTC
Maximum Time: 2024 Sep 12 0012 UTC
End Time: 2024 Sep 12 0032 UTC
X-ray Class: M5.0
Location: S14W75
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

00:16 UTC

Space Weather Message Code: ALTXMF
Serial Number: 430
Issue Time: 2024 Sep 12 0016 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Sep 12 0011 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

mercredi, 11 septembre 2024

16:43 UTC

Space Weather Message Code: WARK04
Serial Number: 4685
Issue Time: 2024 Sep 11 1643 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Sep 11 1642 UTC
Valid To: 2024 Sep 11 2359 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

mardi, 10 septembre 2024

17:37 UTC

Space Weather Message Code: WATA30
Serial Number: 243
Issue Time: 2024 Sep 10 1737 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 11: G1 (Minor) Sep 12: G1 (Minor) Sep 13: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

11:54 UTC

Space Weather Message Code: SUMPX1
Serial Number: 115
Issue Time: 2024 Sep 10 1154 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Sep 09 1640 UTC
Maximum Time: 2024 Sep 09 2250 UTC
End Time: 2024 Sep 10 0555 UTC
Maximum 10MeV Flux: 34 pfu
NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

00:41 UTC

Space Weather Message Code: ALTTP4
Serial Number: 663
Issue Time: 2024 Sep 10 0041 UTC

ALERT: Type IV Radio Emission
Begin Time: 2024 Sep 09 2353 UTC



Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

00:03 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1356
Issue Time: 2024 Sep 10 0003 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Sep 09 2345 UTC
Estimated Velocity: 408 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

lundi, 9 septembre 2024

19:43 UTC

Space Weather Message Code: WARPX1
Serial Number: 575
Issue Time: 2024 Sep 09 1943 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 574
Valid From: 2024 Sep 09 0750 UTC
Now Valid Until: 2024 Sep 10 1200 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

17:22 UTC

Space Weather Message Code: ALTPX1
Serial Number: 350
Issue Time: 2024 Sep 09 1722 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Sep 09 1640 UTC
NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

07:49 UTC

Space Weather Message Code: WARPX1
Serial Number: 574
Issue Time: 2024 Sep 09 0749 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2024 Sep 09 0750 UTC
Valid To: 2024 Sep 09 2000 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

05:54 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1355
Issue Time: 2024 Sep 09 0554 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Sep 09 0510 UTC
Estimated Velocity: 668 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

dimanche, 8 septembre 2024

07:53 UTC

Space Weather Message Code: WATA30
Serial Number: 242
Issue Time: 2024 Sep 08 0753 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 09: None (Below G1) Sep 10: G2 (Moderate) Sep 11: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

01:29 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1354
Issue Time: 2024 Sep 08 0129 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Sep 08 0057 UTC
Estimated Velocity: 924 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

mercredi, 4 septembre 2024

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4684
Issue Time: 2024 Sep 04 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4683
Valid From: 2024 Sep 04 1055 UTC
Now Valid Until: 2024 Sep 04 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

15:18 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3398
Issue Time: 2024 Sep 04 1518 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2024 Sep 04 1455 UTC
Station: GOES16




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

11:00 UTC

Space Weather Message Code: SUMSUD
Serial Number: 277
Issue Time: 2024 Sep 04 1100 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2024 Sep 04 1030 UTC
Deviation: 40 nT
Station: BOU

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

10:43 UTC

Space Weather Message Code: WARK05
Serial Number: 1921
Issue Time: 2024 Sep 04 1043 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Sep 04 1043 UTC
Valid To: 2024 Sep 04 1800 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

10:43 UTC

Space Weather Message Code: ALTK04
Serial Number: 2469
Issue Time: 2024 Sep 04 1043 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Sep 04 1039 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:39 UTC

Space Weather Message Code: WARK04
Serial Number: 4683
Issue Time: 2024 Sep 04 1039 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Sep 04 1055 UTC
Valid To: 2024 Sep 04 1800 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:17 UTC

Space Weather Message Code: WARSUD
Serial Number: 233
Issue Time: 2024 Sep 04 1017 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2024 Sep 04 1030 UTC
Valid To: 2024 Sep 04 1100 UTC
IP Shock Passage Observed: 2024 Sep 04 0940 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

03:04 UTC

Space Weather Message Code: SUM10R
Serial Number: 833
Issue Time: 2024 Sep 04 0304 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Sep 04 0250 UTC
Maximum Time: 2024 Sep 04 0251 UTC
End Time: 2024 Sep 04 0251 UTC
Duration: 1 minutes
Peak Flux: 250 sfu
Latest Penticton Noon Flux: 242 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

mardi, 3 septembre 2024

12:55 UTC

Space Weather Message Code: WARPX1
Serial Number: 573
Issue Time: 2024 Sep 03 1255 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2024 Sep 03 1255 UTC
Valid To: 2024 Sep 04 1200 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

08:42 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1353
Issue Time: 2024 Sep 03 0842 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Sep 03 0753 UTC
Estimated Velocity: 547 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

dimanche, 1 septembre 2024

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4682
Issue Time: 2024 Sep 01 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4681
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Sep 02 0600 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

14:41 UTC

Space Weather Message Code: SUMXM5
Serial Number: 258
Issue Time: 2024 Sep 01 1441 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Sep 01 1141 UTC
Maximum Time: 2024 Sep 01 1322 UTC
End Time: 2024 Sep 01 1436 UTC
X-ray Class: M5.5
Location: S21E90
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

13:03 UTC

Space Weather Message Code: ALTXMF
Serial Number: 429
Issue Time: 2024 Sep 01 1303 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Sep 01 1300 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

11:58 UTC

Space Weather Message Code: WARK04
Serial Number: 4681
Issue Time: 2024 Sep 01 1158 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4680
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Sep 01 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

samedi, 31 août 2024

23:21 UTC

Space Weather Message Code: WARK04
Serial Number: 4680
Issue Time: 2024 Aug 31 2321 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4679
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Sep 01 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

20:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4679
Issue Time: 2024 Aug 31 2055 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4678
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Aug 31 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

17:16 UTC

Space Weather Message Code: ALTK05
Serial Number: 1633
Issue Time: 2024 Aug 31 1716 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Aug 31 1715 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

16:15 UTC

Space Weather Message Code: WARK05
Serial Number: 1920
Issue Time: 2024 Aug 31 1615 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Aug 31 1612 UTC
Valid To: 2024 Aug 31 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

14:44 UTC

Space Weather Message Code: WARK04
Serial Number: 4678
Issue Time: 2024 Aug 31 1444 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4677
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Aug 31 2100 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

09:14 UTC

Space Weather Message Code: ALTK05
Serial Number: 1632
Issue Time: 2024 Aug 31 0914 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Aug 31 0900 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

08:56 UTC

Space Weather Message Code: WARK04
Serial Number: 4677
Issue Time: 2024 Aug 31 0856 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4676
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Aug 31 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

08:56 UTC

Space Weather Message Code: WARK05
Serial Number: 1919
Issue Time: 2024 Aug 31 0856 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1918
Valid From: 2024 Aug 30 2335 UTC
Now Valid Until: 2024 Aug 31 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

vendredi, 30 août 2024

23:59 UTC

Space Weather Message Code: ALTK05
Serial Number: 1631
Issue Time: 2024 Aug 30 2359 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Aug 30 2359 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

23:34 UTC

Space Weather Message Code: WARK05
Serial Number: 1918
Issue Time: 2024 Aug 30 2334 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Aug 30 2335 UTC
Valid To: 2024 Aug 31 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

23:34 UTC

Space Weather Message Code: WARK04
Serial Number: 4676
Issue Time: 2024 Aug 30 2334 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4675
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Aug 31 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

13:21 UTC

Space Weather Message Code: WARK04
Serial Number: 4675
Issue Time: 2024 Aug 30 1321 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4674
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Aug 30 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

08:52 UTC

Space Weather Message Code: ALTK04
Serial Number: 2468
Issue Time: 2024 Aug 30 0852 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Aug 30 0852 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

08:49 UTC

Space Weather Message Code: WARK04
Serial Number: 4674
Issue Time: 2024 Aug 30 0849 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Aug 30 0849 UTC
Valid To: 2024 Aug 30 1500 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

mercredi, 28 août 2024

21:13 UTC

Space Weather Message Code: WATA20
Serial Number: 1011
Issue Time: 2024 Aug 28 2113 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Aug 29: G1 (Minor) Aug 30: None (Below G1) Aug 31: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: Lingering CME effects are likely to cause geomagnetic storming during the early hours of 29 Aug.

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

07:32 UTC

Space Weather Message Code: WARK05
Serial Number: 1917
Issue Time: 2024 Aug 28 0732 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1916
Valid From: 2024 Aug 28 0133 UTC
Now Valid Until: 2024 Aug 28 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

07:28 UTC

Space Weather Message Code: WARK04
Serial Number: 4673
Issue Time: 2024 Aug 28 0728 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4672
Valid From: 2024 Aug 27 2323 UTC
Now Valid Until: 2024 Aug 28 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

07:03 UTC

Space Weather Message Code: ALTK05
Serial Number: 1630
Issue Time: 2024 Aug 28 0703 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Aug 28 0659 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

03:01 UTC

Space Weather Message Code: ALTK06
Serial Number: 589
Issue Time: 2024 Aug 28 0301 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Aug 28 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

02:23 UTC

Space Weather Message Code: WARK06
Serial Number: 540
Issue Time: 2024 Aug 28 0223 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Aug 28 0223 UTC
Valid To: 2024 Aug 28 0900 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

02:12 UTC

Space Weather Message Code: ALTK05
Serial Number: 1629
Issue Time: 2024 Aug 28 0212 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Aug 28 0212 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:33 UTC

Space Weather Message Code: WARK05
Serial Number: 1916
Issue Time: 2024 Aug 28 0133 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Aug 28 0133 UTC
Valid To: 2024 Aug 28 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

00:04 UTC

Space Weather Message Code: ALTK04
Serial Number: 2467
Issue Time: 2024 Aug 28 0004 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Aug 27 2359 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

mardi, 27 août 2024

23:23 UTC

Space Weather Message Code: WARK04
Serial Number: 4672
Issue Time: 2024 Aug 27 2323 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Aug 27 2323 UTC
Valid To: 2024 Aug 28 0900 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

dimanche, 25 août 2024

00:19 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1352
Issue Time: 2024 Aug 25 0019 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Aug 25 0000 UTC
Estimated Velocity: 360 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

vendredi, 23 août 2024

20:27 UTC

Space Weather Message Code: SUMXM5
Serial Number: 257
Issue Time: 2024 Aug 23 2027 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Aug 23 2008 UTC
Maximum Time: 2024 Aug 23 2012 UTC
End Time: 2024 Aug 23 2018 UTC
X-ray Class: M5.1
Location: S27E22
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

20:20 UTC

Space Weather Message Code: ALTXMF
Serial Number: 428
Issue Time: 2024 Aug 23 2020 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Aug 23 2012 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

06:19 UTC

Space Weather Message Code: WARK04
Serial Number: 4671
Issue Time: 2024 Aug 23 0619 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Aug 23 0619 UTC
Valid To: 2024 Aug 23 1200 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

03:54 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1351
Issue Time: 2024 Aug 23 0354 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Aug 23 0343 UTC
Estimated Velocity: 347 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

02:20 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1350
Issue Time: 2024 Aug 23 0220 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Aug 23 0119 UTC
Estimated Velocity: 236 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

jeudi, 22 août 2024

02:46 UTC

Space Weather Message Code: WARK04
Serial Number: 4670
Issue Time: 2024 Aug 22 0246 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Aug 22 0246 UTC
Valid To: 2024 Aug 22 0900 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

mercredi, 21 août 2024

22:30 UTC

Space Weather Message Code: SUMXM5
Serial Number: 256
Issue Time: 2024 Aug 21 2230 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Aug 21 2159 UTC
Maximum Time: 2024 Aug 21 2208 UTC
End Time: 2024 Aug 21 2217 UTC
X-ray Class: M5.1
Location: S03E31
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

22:11 UTC

Space Weather Message Code: ALTXMF
Serial Number: 427
Issue Time: 2024 Aug 21 2211 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Aug 21 2207 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

05:59 UTC

Space Weather Message Code: WARK04
Serial Number: 4669
Issue Time: 2024 Aug 21 0559 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4668
Valid From: 2024 Aug 21 0147 UTC
Now Valid Until: 2024 Aug 21 0900 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

01:47 UTC

Space Weather Message Code: WARK04
Serial Number: 4668
Issue Time: 2024 Aug 21 0147 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Aug 21 0147 UTC
Valid To: 2024 Aug 21 0600 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

dimanche, 18 août 2024

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4667
Issue Time: 2024 Aug 18 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4666
Valid From: 2024 Aug 17 1354 UTC
Now Valid Until: 2024 Aug 18 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

13:46 UTC

Space Weather Message Code: WATA20
Serial Number: 1010
Issue Time: 2024 Aug 18 1346 UTC

CANCEL WATCH: Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 1009
Original Issue Time: 2024 Aug 15 1358 UTC

Comment: Current conditions no longer warrent this Watch.

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.