In addition to flight disruptions, Thursday's severe weather led to hundreds of power outages and some traffic delays.

A mix of snow, sleet and freezing precipitation is leading to sloppy road conditions in the Dallas-Fort Worth metroplex and beyond.

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.