CME Passage Continues; G3-G4 Still Possible Tonight, June 1st

The G4 (Severe) geomagnetic storm watch remains in effect for tonight, June 1st (EDT), as CME passage continues. There are indications that the coronal mass ejection (CME) passage is weakening, but the solar wind conditions remain elevated, therefore additional periods of G3-G4 (Strong-Severe) levels remain possible. However, we now anticipate that conditions should weaken enough by tomorrow evening, June 2nd (EDT), that G1 (Minor) storm levels is the most likely peak response.