…An Arctic air  will continue to push the temperatures down trough  central and eastern United States….

…Snowfall is going to pile up around the Great Lakes…

…Lots of heavy rains and snow up in the mountain is expected in the northwestern part of the United States…

…A clipper system will streak snows from the northern Plains to the northern Mid-Atlantic states…

Sunday Night

Conditions will begin to dry out along the Eastern Seaboard Sunday night as a deep surface cyclone over southeast Ontario lifts towards the Canadian maritimes and the trailing cold front pushes off the Atlantic coast. Behind the system…an Arctic airmass that already invaded the north central U.S. will spread southeastward…plunging temperatures from the Mississippi Valley to East Coast. The cold air blowing over warmer waters will allow snow showers to crank up across the Great Lakes region…especially downwind of Lake Ontario and Erie.

A rich plume of moisture streaming inland ahead of a Pacific system crashing into British Columbia Sunday night will fuel widespread precipitation across the northwestern corner of the Nation early this week. Heavy rains are expected along the Washington coast while snowfall accumulations in excess of a foot will be possible in the Cascades and northern Rockies.

Monday – Tuesday

Energy dropping out of Western Canada will streak a weak wave of low pressure from the northern Plains to the northern Mid-Atlantic Monday into Tuesday. The clipper system will be quite moisture starved; However…a fresh surge of Arctic air across the Central and Eastern U.S. will allow for a swath of accumulating snows to the north of the low track.

source: NOAA

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