Flood alerts issued for large swath of U.S. Heavy rain and storms are expected for much of the nation Tuesday, as a system moving east encounters an existing one over the Plains. 'Tennis-ball-sized' hail spotted »

Flood alerts issued for large swath of U.S. Heavy rain and storms are expected for much of the nation Tuesday, as a system moving east encounters an existing one over the Plains. 'Tennis-ball-sized' hail spotted »