Threat of tornadoes moves south after storm unleashes winds and fans wildfires

Mark Nelson, of Wis., waits with his tractor-trailer after it overturned during high winds and a possible tornado on Interstate 44 westbound at Villa Ridge, Mo., on Friday.

The threat of tornadoes moved east into the Mississippi Valley and Deep South on Saturday, a day after a massive storm system unleashed winds that damaged buildings in several central states.

(Image credit: Robert Cohen/AP)