 Some locations that will experience flash flooding include Pella, Grenell, Knoxville, Monroe, Pleasantville, Prairie City, Melcher, Dallas, Lake Red Rock, Knoxville Raceway, Sully, Linville, Harvey, Layton, Reisner, Searsboro, Swan, Pella Municipal Airport, Elk Rock State Park, Knoxville Municipal Airport and Grenell Regional Airport.