 The National Weather Service in Norman has issued a severe thunderstorm warning for southwestern Dewey County in northwestern Oklahoma until 9 p.m. Central Daylight Time. At 8.23 p.m. Central Daylight Time, a severe thunderstorm was located 4 miles northeast of Leedy and is nearly stationary. Expected hazards include 60 miles an hour wind gusts and quarter-size hail. This is a radar-indicated threat.