Local 5/5/2026, 2:49:25 AM
UTC 2026-05-05T02:49:25.467Z
Space Weather Message Code: ALTK05Serial Number: 2016Issue Time: 2026 May 05 0249 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 May 05 0244 UTCSynoptic Period: 0000-0300 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 5/4/2026, 11:55:23 PM
UTC 2026-05-04T23:55:23.583Z
Space Weather Message Code: ALTK05Serial Number: 2015Issue Time: 2026 May 04 2355 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 May 04 2355 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 5/4/2026, 11:39:44 PM
UTC 2026-05-04T23:39:44.003Z
Space Weather Message Code: WARK04Serial Number: 5334Issue Time: 2026 May 04 2339 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5333Valid From: 2026 May 04 1645 UTCNow Valid Until: 2026 May 05 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 5/4/2026, 11:39:43 PM
UTC 2026-05-04T23:39:43.977Z
Space Weather Message Code: WARK05Serial Number: 2232Issue Time: 2026 May 04 2339 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2231Valid From: 2026 May 04 1945 UTCNow Valid Until: 2026 May 05 0900 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 5/4/2026, 11:39:43 PM
UTC 2026-05-04T23:39:43.937Z
Space Weather Message Code: WARK06Serial Number: 657Issue Time: 2026 May 04 2339 UTCEXTENDED WARNING: Geomagnetic K-Index of 6 expectedExtension to Serial Number: 656Valid From: 2026 May 04 2031 UTCNow Valid Until: 2026 May 05 0600 UTCWarning Condition: PersistenceNOAA 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 5/4/2026, 8:32:50 PM
UTC 2026-05-04T20:32:50.633Z
Space Weather Message Code: ALTK06Serial Number: 715Issue Time: 2026 May 04 2032 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2026 May 04 2032 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 5/4/2026, 8:31:44 PM
UTC 2026-05-04T20:31:44.840Z
Space Weather Message Code: WARK06Serial Number: 656Issue Time: 2026 May 04 2031 UTCWARNING: Geomagnetic K-Index of 6 expectedValid From: 2026 May 04 2031 UTCValid To: 2026 May 05 0000 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 5/4/2026, 7:51:43 PM
UTC 2026-05-04T19:51:43.590Z
Space Weather Message Code: ALTK05Serial Number: 2014Issue Time: 2026 May 04 1951 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 May 04 1951 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 5/4/2026, 7:50:55 PM
UTC 2026-05-04T19:50:55.110Z
Space Weather Message Code: WARK05Serial Number: 2231Issue Time: 2026 May 04 1950 UTCWARNING: Geomagnetic K-index of 5 expectedValid From: 2026 May 04 1945 UTCValid To: 2026 May 05 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.