The Storm Prediction Center has issued a Severe Thunderstorm Watch in effect until Midnight Tuesday. The following counties are in the watch: Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque, Iowa, Jackson, Johnson, Jones, Keokuk, Linn, Muscatine, Scott, Washington counties in Iowa and Carroll, Jo Daviess, Rock Island, Stephenson and Whiteside in Illinois.