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National Oceanic and Atmospheric Administration

Friday, July 25, 2025 18:17:03 UTC

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NOAA Scales mini

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) Storm Warning in Effect from 21/0432 to 21/1800 UTC

G1 (Minor) Storm Warning in Effect from 21/0432 to 21/1800 UTC
published: Tuesday, November 21, 2017 23:19 UTC

A G1 (Minor) geomagnetic storm warning is in effect from 21/0432 to 21/1800 UTC due to persistent positive polarity CH HSS effects. G1 (Minor) alerts were issued at 21/0530 and 21/0825 UTC. Stay tuned here for updates.