The Storm Prediction Center has issued a TORNADO WATCH in effect until Midnight Monday morning for the following counties in Iowa, Adair, Adams, Boone, Butler, Cass, Clarke, Dallas, Decatur, Franklin, Greene, Grundy, Guthrie, Hamilton, Hardin, Jasper, Madison, Marshall, Polk, Ringgold, Story, Taylor, Union, Warren, Appanoose, Black Hawk, Bremer, Davis, Lucas, Mahaska, Marion, Monroe, Poweshiek, Tama, Wapello, Wayne, Allamakee, Fayette, Clayton, Benton, Buchanan, Delaware, Dubuque, Iowa, Jackson, Jones, Keokuk and Linn. Tornadoes have already touched the ground in Linn County and more tornadoes will be possible in the watch area.