Space Weather Message Code: WARK04
Serial Number: 4387
Issue Time: 2023 May 24 0255 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4386
Valid From: 2023 May 23 2220 UTC
Now Valid Until: 2023 May 24 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
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.