Dallas-Fort Worth area flights scheduled for Friday have already begun being nixed after a winter storm prompted mass cancelations on Thursday. More than 200 flights in and out of DFW International Airport Friday have been canceled,

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.