The Storm Prediction Center has issued a Severe Thunderstorm watch in effect until 10pm. This includes the following counties in Iowa, Buena Vista, Cherokee, Ida, Plymouth, Woodbury, Adair, Adams, Appanoose, Audubon, Black Hawk, Boone, Bremer, Butler, Calhoun, Carroll, Cass, Clarke, Crawford, Dallas, Davis, Decatur, Franklin, Greene, Grundy, Guthrie, Hamilton, Hardin, Humboldt, Jasper, Lucas, Madison, Mahaska, Marion, Marshall, Monroe, Pocahontas, Polk, Poweshiek, Ringgold, Sac, Story, Tama, Taylor, Union, Wapello, Warren, Wayne, Webster, Wright, Fremont, Harrison, Mills, Monona, Montgomery, Page, Pottawattamie, Shelby, Benton, Buchanan, Des Moines, Henry, Iowa, Jefferson, Johnson, Keokuk, Lee, Linn, Louisa, Van Buren, Washington.