The Northern Lights may be seen Monday, Sept. 16 as far south as California, Missouri and Colorado after major solar activity over the weekend.

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.