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.

The NWS has issued storm and extreme cold warnings this weekend as powerful Arctic winds plunge temperatures nationwide.

Residents along the East Coast, from the Northern Plains to the tip of Maine, are bracing for several inches of snow on Sunday followed by dangerously cold temperatures.