Snowfall Map through Wednesday Morning
A second area of low pressure will form over eastern New England Tuesday, leading to additional snow from parts of eastern Ontario through Quebec and into Maine and New Brunswick through Wednesday morning.
Freezing rain, sleet, rain and drizzle will also be present with the snow, though not a lot across the St. Lawrence Valley around Montreal through tonight then transition to mostly snow Tuesday evening.
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Also,
A lake-effect snow event is likely for the snowbelt regions southeast and east-southeast of Lake Huron and Georgian Bay starting Friday evening in the southwest and later Friday night and early Saturday farther to the northeast as the cold air takes a while to get in. Strong winds could also be a factor, especially near the southern end of Lake Huron Friday night and early Saturday. This event should assure some localized areas a white Christmas, while snow showers and flurries persist outside the snowbelts across Ontario into Saturday.
Yes, it will be colder late this week and into next week over southeastern Canada and the eastern U.S., but I do not see any sustained Arctic air getting into these regions through the next 10 days or so as there is just too much troughiness over western North America.
Arctic air will get into northern B.C. then the Prairies late this week, but will likely stay away from southwest B.C.
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