 The National Weather Service in Norman has issued a severe thunderstorm warning for northwestern Grady County in central Oklahoma, east central Caddo County in southwestern Oklahoma, southern Canadian County in central Oklahoma, until 5.30 p.m. Central Daylight Time. At 4.51 p.m. Central Daylight Time, a severe thunderstorm was located near Kogar, moving east at 20 miles an hour. Expected hazards include 60 miles an hour wind gusts and quarter-size hail.