 The National Weather Service in the Quad Cities has issued a severe thunderstorm warning for southwestern Buchanan County, northern Benton County, until 4.45 p.m. At 3.37 p.m., a severe thunderstorm was located over T.F. Clark State Park, or 17 miles south of Waterloo, moving east at 30 miles an hour. Expected hazards include 60 miles an hour wind gusts and half-dollar size hail. Hail damage to vehicles is expected.