SOLE
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R
Blackout radio
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S
Tempeste solari
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G
Tempeste geomagnetiche
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Quiet
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Quiet
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Quiet
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ULTIMO MESSAGGIO DI ALLERTA DAL NOAA
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Space Weather Message Code: WARK04
Serial Number: 4936
Issue Time: 2025 Apr 21 2356 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4935
Valid From: 2025 Apr 21 0218 UTC
Now Valid Until: 2025 Apr 22 1159 UTC
Warning Condition: Persistence
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.
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