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.

Severe weather outbreak kills at least a dozen people as storms, tornadoes moved across the Midwest and South.

A dynamic storm that prompted foreboding predictions of dangerous weekend weather spawned tornadoes, dust storms and wildfires that killed at least 39 people and destroyed hundreds of homes and businesses.

Violent tornadoes ripped through parts of the U.S., wiping out schools and toppling semitractor-trailers in several states.