Cold temperatures and winter storm systems continue to sweep across the United States.
A blast of Arctic air will bring temperatures 10 to 20 degrees Fahrenheit below average to all regions east of the Mississippi River. On Monday, the coldest areas will be the northern Plains, the Upper Midwest and the Great Lakes.
By Tuesday morning, isolated record lows are possible in the Northeast, but this air mass is not as cold as the one that produced several record lows last week.
Cold temperatures will persist through Tuesday and are expected to warm up midweek, before another surge of cold air moves in by Friday.
In addition to the bitterly cold conditions hitting the eastern stretch of the country, several fast-moving winter storms will impact the Midwest, the Great Lakes, the mid-Atlantic and New England throughout the week.
Winter weather alerts in the mid-Atlantic
At least 12 million people face winter weather alerts stretching from eastern Kentucky through Virginia and into northern North Carolina.
A quick-moving storm will move through this region Monday, producing 2 to 4 inches of snowfall from Beckley, West Virginia, to Richmond, Virginia. Local amounts of 4 to 5 inches are possible across central Virginia, including the Roanoke area.
Washington, D.C., is expected to see light flurries from this storm system, which will clear by Monday evening.
Snow in the Upper Midwest, the Great Lakes and New England
Another storm is forecast to hit North Dakota on Tuesday morning.
It will move across the Upper Midwest and the Great Lakes before bringing snow to the interior Northeast and New England on Wednesday.
As much as 4 to 6 inches of snowfall is expected in Duluth, Green Bay and western Michigan. Up to 2 inches will hit Minneapolis, Madison, Milwaukee and Detroit.
Minneapolis is forecast to be right on the line separating light snow from heavier snow, so any shift in the forecast could bring higher totals into that metro area Tuesday.
Atmospheric river storm in the Pacific Northwest
At least 9 million people are under flood watches across parts of western Washington and northwestern Oregon. Heavy rain will hit this region Monday morning.
The atmospheric river will continue to fuel torrential rain through Wednesday.
About 6 to 10 inches of rainfall is expected in the Olympics and Cascades, with up to 12 inches possible in local parts of the southern Cascades.
Portland can expect 3 to 5 inches of rain, and Seattle could see 1 to 2 inches.
