Local 2/23/2026, 10:05:19 PM
UTC 2026-02-23T22:05:19.380Z
Space Weather Message Code: WARK04Serial Number: 5269Issue Time: 2026 Feb 23 2205 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5268Valid From: 2026 Feb 21 2230 UTCNow Valid Until: 2026 Feb 24 1200 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/23/2026, 9:39:45 PM
UTC 2026-02-23T21:39:45.773Z
Space Weather Message Code: WARK05Serial Number: 2200Issue Time: 2026 Feb 23 2139 UTCWARNING: Geomagnetic K-index of 5 expectedValid From: 2026 Feb 23 2140 UTCValid To: 2026 Feb 24 0600 UTCWarning Condition: OnsetNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/23/2026, 11:34:57 AM
UTC 2026-02-23T11:34:57.033Z
Space Weather Message Code: ALTEF3Serial Number: 3632Issue Time: 2026 Feb 23 1134 UTCALERT: Electron 2MeV Integral Flux exceeded 1000pfuThreshold Reached: 2026 Feb 23 1045 UTCStation: GOES19Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Local 2/23/2026, 5:56:31 AM
UTC 2026-02-23T05:56:31.393Z
Space Weather Message Code: WARK05Serial Number: 2199Issue Time: 2026 Feb 23 0556 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2198Valid From: 2026 Feb 22 2154 UTCNow Valid Until: 2026 Feb 23 1500 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/23/2026, 5:56:31 AM
UTC 2026-02-23T05:56:31.393Z
Space Weather Message Code: WARK04Serial Number: 5268Issue Time: 2026 Feb 23 0556 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5267Valid From: 2026 Feb 21 2230 UTCNow Valid Until: 2026 Feb 23 2359 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/23/2026, 4:45:12 AM
UTC 2026-02-23T04:45:12.537Z
Space Weather Message Code: ALTK05Serial Number: 1970Issue Time: 2026 Feb 23 0445 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Feb 23 0437 UTCSynoptic Period: 0300-0600 UTCActive Warning: YesNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/22/2026, 10:02:32 PM
UTC 2026-02-22T22:02:32.507Z
Space Weather Message Code: ALTK05Serial Number: 1969Issue Time: 2026 Feb 22 2202 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Feb 22 2202 UTCSynoptic Period: 2100-2400 UTCActive Warning: YesNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/22/2026, 10:00:00 PM
UTC 2026-02-22T22:00:00.483Z
Space Weather Message Code: WARK04Serial Number: 5267Issue Time: 2026 Feb 22 2200 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5266Valid From: 2026 Feb 21 2230 UTCNow Valid Until: 2026 Feb 23 1200 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/22/2026, 9:54:57 PM
UTC 2026-02-22T21:54:57.153Z
Space Weather Message Code: WARK05Serial Number: 2198Issue Time: 2026 Feb 22 2154 UTCWARNING: Geomagnetic K-index of 5 expectedValid From: 2026 Feb 22 2154 UTCValid To: 2026 Feb 23 0600 UTCWarning Condition: OnsetNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/22/2026, 8:00:36 AM
UTC 2026-02-22T08:00:36.323Z
Space Weather Message Code: WARK05Serial Number: 2197Issue Time: 2026 Feb 22 0800 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2196Valid From: 2026 Feb 22 0425 UTCNow Valid Until: 2026 Feb 22 1800 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/22/2026, 8:00:36 AM
UTC 2026-02-22T08:00:36.310Z
Space Weather Message Code: WARK06Serial Number: 642Issue Time: 2026 Feb 22 0800 UTCWARNING: Geomagnetic K-Index of 6 expectedValid From: 2026 Feb 22 0800 UTCValid To: 2026 Feb 22 1500 UTCWarning Condition: OnsetNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/22/2026, 8:00:36 AM
UTC 2026-02-22T08:00:36.310Z
Space Weather Message Code: WARK04Serial Number: 5266Issue Time: 2026 Feb 22 0800 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5265Valid From: 2026 Feb 21 2230 UTCNow Valid Until: 2026 Feb 22 2359 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/22/2026, 7:40:56 AM
UTC 2026-02-22T07:40:56.850Z
Space Weather Message Code: ALTK05Serial Number: 1968Issue Time: 2026 Feb 22 0740 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Feb 22 0740 UTCSynoptic Period: 0600-0900 UTCActive Warning: YesNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/22/2026, 5:03:07 AM
UTC 2026-02-22T05:03:07.680Z
Space Weather Message Code: ALTK05Serial Number: 1967Issue Time: 2026 Feb 22 0503 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Feb 22 0502 UTCSynoptic Period: 0300-0600 UTCActive Warning: YesNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/22/2026, 4:25:33 AM
UTC 2026-02-22T04:25:33.363Z
Space Weather Message Code: WARK05Serial Number: 2196Issue Time: 2026 Feb 22 0425 UTCWARNING: Geomagnetic K-index of 5 expectedValid From: 2026 Feb 22 0425 UTCValid To: 2026 Feb 22 1200 UTCWarning Condition: OnsetNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/21/2026, 10:43:31 PM
UTC 2026-02-21T22:43:31.820Z
Space Weather Message Code: ALTK04Serial Number: 2634Issue Time: 2026 Feb 21 2243 UTCALERT: Geomagnetic K-index of 4Threshold Reached: 2026 Feb 21 2242 UTCSynoptic Period: 2100-2400 UTCActive Warning: YesNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 2/21/2026, 10:30:13 PM
UTC 2026-02-21T22:30:13.473Z
Space Weather Message Code: WARK04Serial Number: 5265Issue Time: 2026 Feb 21 2230 UTCWARNING: Geomagnetic K-index of 4 expectedValid From: 2026 Feb 21 2230 UTCValid To: 2026 Feb 22 1200 UTCWarning Condition: OnsetNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.