 The National Weather Service in Norman has issued a severe thunderstorm warning for northwestern Dewey County in northwestern Oklahoma until 5.15 a.m. Central Daylight Time. At 4.40 a.m. Central Daylight Time, a severe thunderstorm was located four miles south of Camargo, moving east at 25 miles an hour. Expected hazards include 60 miles an hour wind gusts and half-dollar-sized hail. This is a radar-indicated threat.