Skywatchers in up to 18 U.S. states could witness auroras in the coming days as a "moderate" geomagnetic storm rocks Earth's magnetic field, starting on Friday (June 13).
On Wednesday (June 11), the National Oceanic and Atmospheric Administration's (NOAA) Space Weather Prediction Center issued an initial alert for a G2 (moderate) geomagnetic storm starting on Saturday (June 14). On Friday, the center released an updated warning that the storm could begin later the same day. The space weather event is predicted to end on Sunday (June 15) or Monday (June 16).
