Monday Morning (6 AM-Noon): David Payne says this is when the severe weather and tornado threat are at their highest. The line of storms will push east, with the potential for severe weather, including tornadoes, hail up to the size of quarters, and winds around 70 mph. For the OKC metro, the threat is from 5 a.m. to about 10 a.m.

A tornado has touched down in Oklahoma after the National Weather Service urged residents to "take cover now" because of the incoming storm.