G2 geomagnetic storm watch issued for May 15, aurora possible across northern U.S.
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May 14, 2026
A G2 - Moderate geomagnetic storm watch is in effect for May 15, 2026, due to the anticipated impact of a corotating interaction region (CIR) associated with a negative polarity coronal hole high speed stream (CH HSS). G1 conditions are forecast for May 16 and 17.
Source
Discussion in the ATmosphere