Previous SWPC news items.
NOAA Scales mini
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.
More about the NOAA Space Weather Scales
Navigation: Low-frequency navigation signals degraded for brief intervals.
News Archive
News Archive
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G4 (Severe) Geomagnetic Storm Levels Observed | Wednesday, April 16, 2025 - 21:31 |
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G4 (Severe) Geomagnetic Storm Watch in Effect for 2 June UTC-Day | Saturday, May 31, 2025 - 14:53 |
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G4 (Severe) Geomagnetic Storming Observed | Tuesday, September 17, 2024 - 03:54 |
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G4 (Severe) Storm Watch for 10-11 October | Wednesday, October 9, 2024 - 13:35 |
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G4 Alert: Another storm reaches severe levels | Monday, June 22, 2015 - 19:41 |