Local 12/3/2025, 11:56:23 PM
UTC 2025-12-03T23:56:23.500Z
Space Weather Message Code: WARK05Serial Number: 2146Issue Time: 2025 Dec 03 2356 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2145Valid From: 2025 Dec 03 1425 UTCNow Valid Until: 2025 Dec 04 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 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 12/3/2025, 11:55:43 PM
UTC 2025-12-03T23:55:43.887Z
Space Weather Message Code: WARK04Serial Number: 5172Issue Time: 2025 Dec 03 2355 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5171Valid From: 2025 Dec 03 1022 UTCNow Valid Until: 2025 Dec 04 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 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 12/3/2025, 10:38:06 PM
UTC 2025-12-03T22:38:06.460Z
Space Weather Message Code: ALTK05Serial Number: 1922Issue Time: 2025 Dec 03 2238 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Dec 03 2215 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 12/3/2025, 8:48:32 PM
UTC 2025-12-03T20:48:32.057Z
Space Weather Message Code: ALTK07Serial Number: 200Issue Time: 2025 Dec 03 2048 UTCALERT: Geomagnetic K-index of 7Threshold Reached: 2025 Dec 03 2031 UTCSynoptic Period: 1800-2100 UTCActive Warning: YesNOAA Scale: G3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 12/3/2025, 8:27:18 PM
UTC 2025-12-03T20:27:18.730Z
Space Weather Message Code: WARK07Serial Number: 139Issue Time: 2025 Dec 03 2027 UTCWARNING: Geomagnetic K-index of 7 or greater expectedValid From: 2025 Dec 03 2025 UTCValid To: 2025 Dec 03 2359 UTCWarning Condition: OnsetNOAA Scale: G3 or greaterNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 12/3/2025, 7:58:49 PM
UTC 2025-12-03T19:58:49.803Z
Space Weather Message Code: ALTK06Serial Number: 677Issue Time: 2025 Dec 03 1958 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2025 Dec 03 1959 UTCSynoptic Period: 1800-2100 UTCActive Warning: YesNOAA 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 12/3/2025, 7:53:38 PM
UTC 2025-12-03T19:53:38.437Z
Space Weather Message Code: WARK06Serial Number: 627Issue Time: 2025 Dec 03 1953 UTCWARNING: Geomagnetic K-Index of 6 expectedValid From: 2025 Dec 03 1952 UTCValid To: 2025 Dec 03 2359 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 12/3/2025, 7:41:44 PM
UTC 2025-12-03T19:41:44.263Z
Space Weather Message Code: ALTK05Serial Number: 1921Issue Time: 2025 Dec 03 1941 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Dec 03 1941 UTCSynoptic Period: 1800-2100 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 12/3/2025, 2:52:03 PM
UTC 2025-12-03T14:52:03.337Z
Space Weather Message Code: ALTK05Serial Number: 1920Issue Time: 2025 Dec 03 1452 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2025 Dec 03 1443 UTCSynoptic Period: 1200-1500 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 12/3/2025, 2:25:18 PM
UTC 2025-12-03T14:25:18.053Z
Space Weather Message Code: WARK05Serial Number: 2145Issue Time: 2025 Dec 03 1425 UTCWARNING: Geomagnetic K-index of 5 expectedValid From: 2025 Dec 03 1425 UTCValid To: 2025 Dec 04 0000 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 12/3/2025, 2:23:34 PM
UTC 2025-12-03T14:23:34.797Z
Space Weather Message Code: ALTK04Serial Number: 2612Issue Time: 2025 Dec 03 1423 UTCALERT: Geomagnetic K-index of 4Threshold Reached: 2025 Dec 03 1419 UTCSynoptic Period: 1200-1500 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 12/3/2025, 10:22:41 AM
UTC 2025-12-03T10:22:41.830Z
Space Weather Message Code: WARK04Serial Number: 5171Issue Time: 2025 Dec 03 1022 UTCWARNING: Geomagnetic K-index of 4 expectedValid From: 2025 Dec 03 1022 UTCValid To: 2025 Dec 03 2359 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.
Local 12/3/2025, 7:06:26 AM
UTC 2025-12-03T07:06:26.573Z
Space Weather Message Code: ALTEF3Serial Number: 3570Issue Time: 2025 Dec 03 0706 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfuContinuation of Serial Number: 3569Begin Time: 2025 Nov 25 1450 UTCYesterday Maximum 2MeV Flux: 8535 pfuPotential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Local 12/2/2025, 5:01:21 AM
UTC 2025-12-02T05:01:21.543Z
Space Weather Message Code: ALTEF3Serial Number: 3569Issue Time: 2025 Dec 02 0501 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfuContinuation of Serial Number: 3568Begin Time: 2025 Nov 25 1450 UTCYesterday Maximum 2MeV Flux: 8521 pfuPotential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.