Even 100 years later, the Tri-State tornado is widely considered America's worst tornado. It killed almost 700 in an era ...

The Tri-State Tornado barreled across more than 200 miles, decimating entire towns in and leaving thousands homeless on 1925.

The same regions devastated by a deadly storm last week could be hit by more tornadoes, thunderstorms, and wildfires as a new severe weather threat looms.