Tornadoes killed at least 32 people across several states in the U.S. Midwest and Southeast on Saturday night, part of a monster storm strong enough to topple tractor-trailers and wipe out hundreds of buildings.

Violent tornadoes and high winds decimated homes, wiped out schools and toppled semitractor-trailers as a monster storm that also produced dust storms and icy conditions killed at least 33 people across the central and southern U.

Millions of Americans across the country are on alert for a severe weather outbreak as violent, long-track tornadoes with damaging winds of up to 80 mph and large hail are expected across the Midwest and South with the cross-country storm moving east.