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Space Weather Message Code: WATA30
Serial Number: 282
Issue Time: 2026 Sep 09 2101 UTC
CANCEL WATCH: Geomagnetic Storm Category G2 Predicted
Cancel Serial Number: 281
Original Issue Time: 2026 Sep 08 1702 UTC
Cancelled Level Predicted:
Sep 08 : None (Bellow G1) Sep 09 : None (Bellow G1) Sep 10 : None (Bellow G1)
Conditions no longer warrant watch criteria.
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.
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Space Weather Message Code: ALTEF3
Serial Number: 3738
Issue Time: 2026 Sep 09 0538 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3738
Begin Time: 2026 Sep 08 1550 UTC
Yesterday Maximum 2MeV Flux: 1003 pfu
CORRECTED
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Space Weather Message Code: ALTEF3
Serial Number: 3738
Issue Time: 2026 Sep 09 0535 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3737
Begin Time: 2026 Sep 08 1550 UTC
Yesterday Maximum 2MeV Flux: 1540 pfu
Max time: 2026 Sep 09 0145 UTC
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Space Weather Message Code: ALTK05
Serial Number: 2049
Issue Time: 2026 Sep 08 1751 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Sep 08 1744 UTC
Synoptic Period: 1500-1800
Active Warning: YES
Noaa Scale: G1 - Minor
Comment:
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.
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Space Weather Message Code: WARK04
Serial Number: 5415
Issue Time: 2026 Sep 08 1730 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5414
Valid From: 2026 Sep 07 0854 UTC
Now Valid Until: 2026 Sep 09 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.
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Space Weather Message Code: WARK05
Serial Number: 2264
Issue Time: 2026 Sep 08 1727 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2263
Valid From: 2026 Sep 07 2000 UTC
Now Valid Until: 2026 Sep 08 2359 UTC
Warning Condition: Persistence
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.
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Space Weather Message Code: WATA30
Serial Number: 281
Issue Time: 2026 Sep 08 1702 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Sep 08: G1 (Minor) Sep 09: G2 (Moderate) Sep 10: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment:
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.
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Space Weather Message Code: ALTEF3
Serial Number: 3737
Issue Time: 2026 Sep 08 1608 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Threshold Reached: 2026 Sep 08 1550 UTC
Station: GOES-19
Comment: Yesterday's max: 373 pfu
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Space Weather Message Code: ALTK05
Serial Number: 2048
Issue Time: 2026 Sep 08 0734 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Sep 08 0730 UTC
Synoptic Period: 0600-0900
Active Warning: YES
Noaa Scale: G1 - Minor
Comment:
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.
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Space Weather Message Code: WARK05
Serial Number: 2263
Issue Time: 2026 Sep 08 0546 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2262
Valid From: 2026 Sep 07 2000 UTC
Now Valid Until: 2026 Sep 08 1800 UTC
Warning Condition: Persistence
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.
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Space Weather Message Code: WARK04
Serial Number: 5414
Issue Time: 2026 Sep 08 0545 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5413
Valid From: 2026 Sep 07 0854 UTC
Now Valid Until: 2026 Sep 08 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.
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Space Weather Message Code: WARK05
Serial Number: 2262
Issue Time: 2026 Sep 07 2001 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Sep 07 2000 UTC
Valid To: 2026 Sep 08 0600 UTC
Warning Conditions: Onset
Noaa Scale: G1 - Minor
Comment:
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.
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Space Weather Message Code: WATA20
Serial Number: 1123
Issue Time: 2026 Sep 07 1635 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Sep 08: G1 (Minor) Sep 09: G1 (Minor) Sep 10: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment:
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.
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Space Weather Message Code: WARK04
Serial Number: 5413
Issue Time: 2026 Sep 07 1413 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5412
Valid From: 2026 Sep 07 0854 UTC
Now Valid Until: 2026 Sep 08 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.
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Space Weather Message Code: ALTK04
Serial Number: 2682
Issue Time: 2026 Sep 07 1108 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Sep 07 1107 UTC
Synoptic Period: 0900-1200
Active Warning: YES
Comment:
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.
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Space Weather Message Code: WARK04
Serial Number: 5412
Issue Time: 2026 Sep 07 0855 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Sep 07 0854 UTC
Valid To: 2026 Sep 07 1800 UTC
Warning Conditions: Onset
Comment:
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.
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Space Weather Message Code: ALTEF3
Serial Number: 3736
Issue Time: 2026 Sep 06 1824 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Threshold Reached: 2026 Sep 06 1822 UTC
Station: GOES-19
Comment:
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Space Weather Message Code: WATA20
Serial Number: 1122
Issue Time: 2026 Sep 06 1212 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Sep 06: None (Below G1) Sep 07: None (Below G1) Sep 08: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment:
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.
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Space Weather Message Code: SUMPX1
Serial Number: 134
Issue Time: 2026 Sep 06 1155 UTC
SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2026 Sep 05 1615 UTC
Maximum Time: 2026 Sep 05 1645 UTC
End Time: 2026 Sep 05 2135 UTC
Maximum 10MeV Flux: 18 pfu
Noaa Scale: S1 - Minor
Comment:
NOAA Scale: S1 - Minor
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Space Weather Message Code: WARPX1
Serial Number: 632
Issue Time: 2026 Sep 05 2358 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 631
Valid From: 2026 Sep 05 1620 UTC
Now Valid Until: 2026 Sep 06 1200 UTC
Warning Condition: Persistence
NOAA Scale: S1 - Minor
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https://www.swpc.noaa.gov/products/alerts-watches-and-warnings