Violent tornadoes hit parts of U.S. as severe storms kill at least 42, unleashing winds and fanning wildfires
Violent tornadoes ripped through parts of the U.S., wiping out schools and toppling semitractor-trailers in several states.
40 dead as storms head east; fire risk remains in parts of U.S.
At least 37 people have died across seven states as powerful storm systems swept through the Midwest and the South.