From mudslides to tornadoes, dangerous weather impacts millions across U.S. - Residents counting the cost of tornado damage - Fire tornadoes: Firefighters in California face a rare and dangerous phenomenon - Southerners are cleaning up from tornadoes that swept the region - 4 killed in a storm system that spawned tornadoes across the southern U.S. - Tornadoes in Texas and Mississippi kill 2 and injure 6 as severe weather system moves east - Four killed as tornadoes rip through southern US - Tornadoes in southern U.S. kill 2 and injure 6 as severe weather system moves east - Storms across the southern U.S. spawn tornadoes, kill at least 4