Space Weather Message Code: WARK04 Serial Number: 3972 Issue Time: 2021 Nov 22 0535 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3971 Valid From: 2021 Nov 22 0130 UTC Now Valid Until: 2021 Nov 22 1200 UTC Warning Condition: Onset 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.
