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.

Thursday to Saturday will have another dangerous winter situation in the southern U.S. Here's a timeline on where and when you have to be at a certain location to avoid the danger.

As points north and east dug out of snow and ice Tuesday, communities in Texas, Oklahoma and Arkansas were preparing. In Texas, crews treated the roads in the Dallas area amid for