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National Oceanic and Atmospheric Administration

Tuesday, September 23, 2025 01:41:26 UTC

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R1 (Minor) Radio Blackout Impacts
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HF Radio: Weak or minor degradation of HF radio communication on sunlit side, occasional loss of radio contact.
Navigation: Low-frequency navigation signals degraded for brief intervals.
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G1 (Minor) Geomagnetic Storm Warning Valid on 19 Feb

OVATION Prime Model Forecast
G1 (Minor) Geomagnetic Storm Warning Valid on 19 Feb
published: Tuesday, February 20, 2018 08:17 UTC

A G1 (Minor) geomagnetic storm warning is valid for 19 Feb from 0244-0900 UTC (19/0944-1600 EST).  A G1 Alert for observed conditions was issued for 19/0259 UTC. Enhancements in visible aurora are likely at high latitudes in the night sector.