Space Weather Message Code: WARK04
Serial Number: 3928
Issue Time: 2021 Sep 08 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3927
Valid From: 2021 Sep 08 0845 UTC
Now Valid Until: 2021 Sep 08 2100 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.

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