Read our Privacy noticeSouthern states are racing to recover from a crippling winter storm that killed at least 80 people before another blast of dangerous cold hits Friday. Mississippi dispatched 500 National Guard troops to clear roads blocked by fallen trees and Tennessee had nearly 1,000 linemen scrambling to restore power to thousands of Nashville homes. The extended deep freeze has left some people increasingly desperate in a region unaccustomed to and ill-equipped for such cold. More than 300,000 U.S. homes and businesses had no electricity Wednesday, according to the outage tracking website poweroutage.us. Warming centers are open across MississippiMississippi officials say it's the state’s worst winter storm since 1994.