Amid a dangerous arctic blast over much of the U.S. this week, snow and ice may bring major travel disruptions and power outages in the South, forecasters warned.

An arctic air mass sprawling across the eastern, central and parts of the western U.S. on Monday will channel temperatures 20-30 degrees below already historically cold January averages and was poised to slam parts of the South with a disruptive winter storm.

Most of the United States is being assailed with extreme winter weather this week as Arctic air blasts south from Canada, snow tracks up the Northeast coast and a potentially crippling winter storm takes aim at the South.

Northwestern New Jersey counties have reported the highest snow totals of up to 7 inches from Sunday’s winter storm. Morris County had the top three totals reported to the National Weather Service with Kinnelon topping the list at 7 inches.

The warning was for Watauga County. "Light snow showers will taper off this morning. An additional light coating of snow is possible," states the NWS Blacksburg VA. The warning is in effect until 7 a.m.

A quick-hitting snowstorm​ is set to hit most of Massachusetts Sunday night into Monday before an arctic blast of air arrives on Tuesday and Wednesday.