chi-photos-chicago-sees-first-snow-of-the-seas-002An Arctic airmass will continue to plunge temperatures across the central and eastern U.S…. …Snowfall accumulations will pile up downwind of the Lower Great Lakes… …Heavy rains and mountain snow expected in the northwestern corner of the Nation… …A clipper system will streak snows from the northern Plains to the northern Mid-Atlantic states… 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. More