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.

Some southern states are bracing for their biggest winter storm in several years as snow falls from the Rockies to the East Coast. On Thursday, the weather starts to deteriorate in northern and western Texas,