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Space Weather Prediction Center
National Oceanic and Atmospheric Administration
From the above site:
Severe and Extreme (G4-G5) Geomagnetic Storms Likely on 12 May 2024
published: Saturday, May 11, 2024 17:54 UTC
Another series of CMEs associated with flare activity from Region 3664 [sunspot region] over the past several days are expected to merge and arrive at Earth by midday (UTC) on 12 May. Periods of G4-G5 (Severe-Extreme) geomagnetic storms are likely to follow the arrival of these CMEs.