 The National Weather Service in the Quad Cities has issued a severe thunderstorm warning for southwestern Rock Island County, northwestern Louisa County, southern Cedar County, southwestern Scott County, southeastern Johnson County, northern Washington County, Muscatine County, until 7 p.m. At 6.12 p.m., a severe thunderstorm was located over Conesville, or 8 miles north of Columbus Junction, moving east at 50 miles an hour.