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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Saturday, April 19, 2025 17:17:45

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NOAA Scales mini

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Space Weather Conditions
on NOAA Scales
24-Hour Observed Maximums
R
no data
S
no data
G
no data
Latest Observed
R
no data
S
no data
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
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R
no data
S
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G
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Current Space Weather Conditions
on NOAA Scales
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.
More about the NOAA Space Weather Scales

CME Passage of 16-17 April Continues

Geomagnetic Storm Continues
CME Passage of 16-17 April Continues
published: Friday, April 18, 2025 00:43 UTC

CME passage continues today, 16 April, with a peak of G4 (Severe) levels reached. CME strength is slowly weakening and while G4 levels are unlikely to be reached again, there remains a slight chance for another G4 level. Current forecast anticipates G1 (Minor) being the most likely result into 17 April, with a chance for G2-G3 (Moderate-Strong) levels overnight. Visit our webpage for the latest information and updates.