Twenty states, from Texas to Delaware, were on alert Friday for snow and ice as the storm continued to move across the South.

The Tennessee Valley could see some of the heaviest snowfall, with 6 inches expected on Friday. A wide swath of the country is under winter weather warnings and advisories and will see impacts including "widespread closures, treacherous travel, scattered power outages, and downed branches," the weather service said.

After a freezing winter storm shut schools, cut power and cancelled or delayed flights, the South is slowly thawing as warmer weather melts snow and ice.