Northern lights could be visible over mid-latitudes across the US and Europe tonight, Sept. 16. A geomagnetic storm watch has been issued by NOAA's Space Weather Prediction Center.

Missed the fun? There’s still great space spotting Tuesday night, with the full harvest blood eclipse supermoon.

The northern lights visible across the United States after a solar flare were the most widespread and intense aurora show since a historic display in May.

The strong geomagnetic storm conditions experienced last night were relished by aurora chasers across the U.S. (those who were still awake anyway). Dakota Snider caught a stunning

Conditions sparked by the CMEs became so strong Monday night that the SWPC issued a “severe geomagnetic storm alert” around 11 p.m. ET. According to the SWPC, the “major disturbance in Earth’s magnetic field” was expected to reach G4 strength.