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.

Philadelphia's highly-anticipated first measurable snowfall this winter is inching closer and closer, with the first flakes expected overnight.

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 weathers start to deteriorate in northern and western Texas,