Violent tornadoes hit parts of U.S. as severe storms kill at least 37, unleashing winds and fanning wildfires
Violent tornadoes ripped through parts of the U.S., wiping out schools and toppling semitractor-trailers in several states.
Extreme weather expected Saturday gets rarely used 'high risk' designation
A dynamic storm system threatening to spawn powerful tornadoes and hail as big as baseballs has earned a relatively rare designation from forecasters.