The Storm Prediction Center has issued a TORNADO Watch effective until 11pm this evening for the following counties, Adair, Adams, Appanoose, Audubon, Boone, Calhoun, Carroll, Cass, Clarke, Dallas, Davis, Decatur, Greene, Guthrie, Hamilton, Jasper, Lucas, Madison, Mahaska, Marion, Monroe, Polk. Ringgold, Story, Taylor, Union, Wapello, Warren, Wayne and Webster. Thunderstorms along a cold front will swing through the central counties of the state (in a somewhat isolated fashion) Some of the storms may produce some brief tornadoes along with large hail and damaging winds.