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.

Hundreds of flights were canceled in Texas on Thursday as a winter storm barreled down on the Dallas area. The storm brought a slippery mix of sleet and snow with two to five inches of snow forecast to fall in some areas,