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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Friday, April 18, 2025 23:41:05

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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
no data
G
no data
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

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.