Space Weather Prediction Center
08/31/2025 | News release | Distributed by Public on 08/31/2025 07:15
G2 (Moderate) G3 (Strong) Geomagnetic Storm Watch for 01/02 Sep 2025
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.
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