NOAA Logo

NWS Logo

Organizations

Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Wednesday, May 07, 2025 04:10:30 UTC

Main menu

NOAA Scales mini

R1 (Minor) Radio Blackout Impacts
close
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

G4 (Severe) Geomagnetic Storm Levels Observed

G4 (Severe) Geomagnetic Storm Levels Observed
published: Friday, April 18, 2025 00:43 UTC

G4 (Severe) Geomagnetic Storm levels were observed at 16/2055 UTC due to activity associated with a pair of CMEs that left the Sun on 13 Apr. Solar wind signatures show signs of weakening, however further activity in the G1-G3 (Minor-Strong) range remain possible.