DES MOINES, Iowa - A night of severe and dangerous storms Wednesday spawned 12 confirmed tornadoes in Iowa and more than two dozen reports of possible twisters in the state, according to the National Weather Service.The NWS said supercells developed over central Iowa during the afternoon on July 14. "The environment was ripe for tornadic development and rotation was evident on radar shortly after storms formed," NWS reported.The hot spot for tornadoes occurred generally south of the Highway 20 corridor and near Nemaha, Lake City, Stanhope, Jewell and Waverly.