The National Weather Service has issued a Tornado Warning for Lincoln and Pottawatomie Counties until 7:30 p.m.
The Norman Forecast Office says a new tornado is likely developing north of I-40 along the Lincoln-Pottawatomie County line.
Nearly 7,600 OG&E customers in Central Oklahoma are without power, according to the utility's System Watch.
More says severe thunderstorms are possible until midnight, with hail up to the size of baseballs and 70-mile-per-hour wind gusts as the main threats with some of the stronger storms.
Tornadoes are also possible, especially in the area from north of Oklahoma City to Medford and Ponca City.
KGOU is currently broadcasting Channel 5 KOCO-TV's First Alert Weather Coverage. Watch here.