'A total loss': Locals describe destruction after extreme US weather kills 20
Several tornado warnings have been issued in Missouri, while Georgia's governor declares a state of emergency.
Hosted on MSN2m
Live Updates: Tornado Threat Skyrockets As Deadly Storm Eyes Arkansas, Mississippi, Alabama, Tennessee
Watch our interview with an emergency room physician here. The Enhanced Fujita (EF) Scale is how we rate tornadoes in the U.S ...