The Storm Prediction Center has issued a TORNADO Watch effective until Midnight Monday morning for the following counties, Appanoose, Boone, Davis, Jasper, Lucas, Mahaska, Marion, Marshall, Monroe, Polk, Poweshiek, Story, Tama, Wapello, Warren and Wayne. This includes the cities of Marshalltown, Des Moines, Ames, Ottumwa and Oskaloosa. Same threats will exist in these areas as in the previous watch box earlier.