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

A sprawling storm system crossing the U.S. caused deadly crashes, overturned semitrucks and fanned dozens of wildfires in several central states, prompting evacuation orders in some communities.

Tornadoes whipped through Missouri on Friday night, ripping apart homes, businesses, and the electrical system. Gov. Mike Kehoe’s Office says at least 12 people have been killed and one person is still missing from the severe weather.

Numerous significant tornadoes are expected Saturday afternoon and evening, with the highest risk across several states in the Deep South, forecasters say.