The Storm Prediction Center has issued a Severe Thunderstorm until 6am for the following counties, Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines, Dubuque, Henry, Iowa, Jackson, Jefferson, Johnson, Jones, Keokuk, Linn, Louisa, Muscatine, Scott, Washington, Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard, Mitchell, Winneshiek, Bremer, Butler, Cerro Gordo, Franklin, Hancock, Humboldt, Kossuth, Winnebago, Worth, Wright, Adair, Audubon, Boone, Calhoun, Carroll, Crawford, Dallas, Emmet, Greene, Guthrie, Hamilton, Hardin, Madison, Palo Alto, Pocahontas, Polk, Sac, Story, Warren, Webster, Black Hawk, Grundy, Jasper, Mahaska, Marion, Marshall, Poweshiek and Tama. NOTE: These counties were added into the watch at 12:45am, Appanoose, Clarke, Davis, Lucas, Monroe, Wapello and Wayne. Lee and Van Buren counties have been added as of 1:05am. Large hail up to golf balls or larger, winds to 60mph and some tornadoes are possible as well.