The Storm Prediction Center has issued a Severe Thunderstorm watch effective until 7pm for the following counties, Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines, Dubuque, Henry, Iowa, Jackson, Jefferson, Johnson, Jones, Keokuk, Lee, Linn, Louisa, Muscatine, Scott, Van Buren, Washington, Allamakee and Clayton. Thunderstorms across SE Iowa and NE Missouri into WC Illinois will move NE through the watch area. Large hail and damaging winds will be the main threats with any storms that move through. More watches are possible with new activity off across central and western Iowa as well.