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Space Weather Message Code: WATA20
Serial Number: 1119
Issue Time: 2026 Aug 09 1338 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Aug 10: None (Below G1) Aug 11: None (Below G1) Aug 12: 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: ALTK06
Serial Number: 725
Issue Time: 2026 Aug 08 2108 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Aug 08 2100 UTC
Synoptic Period: 1800-2100
Active Warning: YES
Noaa Scale: G2 - Moderate
Comment: Corrected for synoptic period
CORRECTED
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.
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Space Weather Message Code: ALTK06
Serial Number: 725
Issue Time: 2026 Aug 08 2100 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Aug 08 2100 UTC
Synoptic Period: 2100-2400
Active Warning: YES
Noaa Scale: G2 - Moderate
Comment:
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.
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Space Weather Message Code: WARK06
Serial Number: 670
Issue Time: 2026 Aug 08 2035 UTC
WARNING: Geomagnetic K-index of 6 expected
Valid From: 2026 Aug 08 2035 UTC
Valid To: 2026 Aug 08 2359 UTC
Warning Conditions: Onset
Noaa Scale: G2 - Moderate
Comment:
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.
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Space Weather Message Code: ALTK05
Serial Number: 2044
Issue Time: 2026 Aug 08 2030 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Aug 08 2030 UTC
Synoptic Period: 1800-2100
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: 2258
Issue Time: 2026 Aug 08 2029 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2257
Valid From: 2026 Aug 08 1222 UTC
Now Valid Until: 2026 Aug 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: WARK04
Serial Number: 5400
Issue Time: 2026 Aug 08 2029 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5399
Valid From: 2026 Aug 08 0958 UTC
Now Valid Until: 2026 Aug 09 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.
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Space Weather Message Code: WARK05
Serial Number: 2257
Issue Time: 2026 Aug 08 1719 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2256
Valid From: 2026 Aug 08 1222 UTC
Now Valid Until: 2026 Aug 08 2100 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.
______________________________________________________
Space Weather Message Code: WARK06
Serial Number: 669
Issue Time: 2026 Aug 08 1336 UTC
WARNING: Geomagnetic K-index of 6 expected
Valid From: 2026 Aug 08 1336 UTC
Valid To: 2026 Aug 08 1800 UTC
Warning Conditions: Onset
Noaa Scale: G2 - Moderate
Comment:
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.
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Space Weather Message Code: ALTK05
Serial Number: 2043
Issue Time: 2026 Aug 08 1314 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Aug 08 1314 UTC
Synoptic Period: 1200-1500
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.
______________________________________________________
Space Weather Message Code: WARK05
Serial Number: 2256
Issue Time: 2026 Aug 08 1223 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Aug 08 1222 UTC
Valid To: 2026 Aug 08 1800 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: ALTK04
Serial Number: 2679
Issue Time: 2026 Aug 08 1140 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Aug 08 1136 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: 5399
Issue Time: 2026 Aug 08 0959 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Aug 08 0958 UTC
Valid To: 2026 Aug 08 2359 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.
______________________________________________________
Space Weather Message Code: WARK04
Serial Number: 5398
Issue Time: 2026 Aug 04 0810 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5397
Valid From: 2026 Aug 02 1237 UTC
Now Valid Until: 2026 Aug 04 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.
______________________________________________________
Space Weather Message Code: WARK04
Serial Number: 5397
Issue Time: 2026 Aug 03 2355 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5396
Valid From: 2026 Aug 02 1237 UTC
Now Valid Until: 2026 Aug 04 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.
______________________________________________________
Space Weather Message Code: WARK04
Serial Number: 5396
Issue Time: 2026 Aug 03 2003 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5395
Valid From: 2026 Aug 02 1237 UTC
Now Valid Until: 2026 Aug 04 0000 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.
______________________________________________________
Space Weather Message Code: WARK05
Serial Number: 2255
Issue Time: 2026 Aug 03 0253 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2254
Valid From: 2026 Aug 02 1427 UTC
Now Valid Until: 2026 Aug 03 1500 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.
______________________________________________________
Space Weather Message Code: WARK04
Serial Number: 5395
Issue Time: 2026 Aug 03 0253 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5394
Valid From: 2026 Aug 02 1237 UTC
Now Valid Until: 2026 Aug 03 2100 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.
______________________________________________________
Space Weather Message Code: ALTK06
Serial Number: 724
Issue Time: 2026 Aug 02 1800 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Aug 02 1759 UTC
Synoptic Period: 1500-1800
Active Warning: YES
Noaa Scale: G2 - Moderate
Comment:
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.
______________________________________________________
Space Weather Message Code: WARK06
Serial Number: 668
Issue Time: 2026 Aug 02 1746 UTC
WARNING: Geomagnetic K-index of 6 expected
Valid From: 2026 Aug 02 1745 UTC
Valid To: 2026 Aug 02 2359 UTC
Warning Conditions: Onset
Noaa Scale: G2 - Moderate
Comment:
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.
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https://www.swpc.noaa.gov/products/alerts-watches-and-warnings