 The National Weather Service in the Quad Cities has issued a severe thunderstorm warning for Buchanan County, northwestern Cedar County, western Dubuque County, northern Johnson County, Benton County, Jones County, Delaware County, Linn County, northeastern Iowa County, until 6.30 p.m. At 5.20 p.m., severe thunderstorms were located along a line extending from Edgewood to near Norway, moving east at 25 miles an hour.