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Последен сигнал или предупреждение от NOAA SWPC за промяна в Космическото време
Space Weather Message Code: WARK04
Serial Number: 3899
Issue Time: 2021 May 13 0531 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3898
Valid From: 2021 May 12 0600 UTC
Now Valid Until: 2021 May 13 1500 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.