Local 9/16/2026, 5:38:03 AM
UTC 2026-09-16T05:38:03.320Z
Space Weather Message Code: WARK04Serial Number: 5418Issue Time: 2026 Sep 16 0538 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 5417 Valid From: 2026 Sep 15 1849 UTC Now Valid Until: 2026 Sep 16 1800 UTC Warning 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 9/16/2026, 12:34:08 AM
UTC 2026-09-16T00:34:08.103Z
Space Weather Message Code: ALTK04Serial Number: 2684Issue Time: 2026 Sep 16 0034 UTCALERT: Geomagnetic K-index of 4 Threshold Reached: 2026 Sep 16 0030 UTC Synoptic Period: 0000-0300 Active Warning: YES Comment:NOAA 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 9/15/2026, 6:56:11 PM
UTC 2026-09-15T18:56:11.670Z
Space Weather Message Code: WARK05Serial Number: 2265Issue Time: 2026 Sep 15 1856 UTCWARNING: Geomagnetic K-index of 5 expected Valid From: 2026 Sep 15 1855 UTC Valid To: 2026 Sep 16 0600 UTC Warning Conditions: Onset Noaa Scale: G1 - Minor Comment:NOAA 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 9/15/2026, 6:50:25 PM
UTC 2026-09-15T18:50:25.120Z
Space Weather Message Code: WARK04Serial Number: 5417Issue Time: 2026 Sep 15 1850 UTCWARNING: Geomagnetic K-index of 4 expected Valid From: 2026 Sep 15 1849 UTC Valid To: 2026 Sep 16 0600 UTC Warning Conditions: Onset Comment:NOAA 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 9/15/2026, 5:37:51 PM
UTC 2026-09-15T17:37:51.220Z
Space Weather Message Code: WATA20Serial Number: 1125Issue Time: 2026 Sep 15 1737 UTCWATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Sep 16: G1 (Minor) Sep 17: G1 (Minor) Sep 18: None (Below G1) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT Comment:NOAA 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.