The Storm Prediction Center has issued a TORNADO Watch effective until 6am Tuesday for the following counties, Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard, Mitchell, Winneshiek, Appanoose, Black Hawk, Bremer, Butler, Davis, Grundy, Jasper, Lucas, Mahaska, Marion, Marshall, Monroe, Poweshiek, Tama, Wapello, Wayne, Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines, Dubuque, Henry, Iowa, Jackson, Jefferson, Johnson, Jones, Keokuk, Lee, Linn, Louisa, Muscatine, Scott, Van Buren, Washington. Storms will fire in the next few hours along the advancing cold front. Along with the threat of tornadoes, damaging winds will be the other threat with these storms.