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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Thursday, September 18, 2025 12:35:54

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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

G2 (Moderate) G3 (Strong) Geomagnetic Storm Watch for 01/02 Sep 2025

Halo CME, Enlil CME forecast, G3 Strong explainations
G2 (Moderate) G3 (Strong) Geomagnetic Storm Watch for 01/02 Sep 2025
published: Thursday, September 04, 2025 07:52 UTC

Active Region 4199 produced a long-duration M2.7 flare that peaked at approximately 30/2002 UTC. An associated full-halo coronal mass ejection (CME) was observed in coronagraph imagery beginning around 30/2015 UTC. The CME was analyzed and is expected to impact Earth late on 01 Sep into early 02 Sep (UTC).  Current modeling suggests G2 (Moderate) geomagnetic storming is likely late on 01 Sep as the CME initially reaches Earth, with subsequent G3 (Strong) storm conditions likely to follow on 02 Sep as the bulk of the storm passes. Stay tuned to our website for updates.