A tornado-producing storm was tearing through southwestern Oklahoma early Monday, with at least one confirmed tornado, the National Weather Service said.

       The storm was near Granite, a town with a population of about 1,600, at about 3:37 a.m. CST, the service said.

       Tornado warnings were in effect for western Washita County, southwestern Custer County, northwestern Kiowa County, northeastern Greer County and southeastern Beckham County.

       This is a developing story. Please check back for updates.