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The Arctic cold front is now (late Monday evening) pressing southeastward across NY,PA and OH taking the brief period of frontal snowfall with it.
The combination of initial rain, followed by some snow and steadily dropping temperatures has resulted in some slick roadways across Ontario and Quebec this evening.
At this time, the lake effect snow is still trying to organize off Georgian Bay and Lake Huron, but I expect a narrow, but potent lake effect snow squall band to move into the London, Ontario area overnight before shifting west and southwest of the city before sunrise.
The graphic below shows the predicted movement of three primary lake-effect snow areas through Tuesday.
Since this band will be shifting a little more quickly than earlier thought I believe most snowfall amounts off Huron will be 15 cm or less, but of course there will be some isolated locations that may see more.
This southern Lake Huron band will weaken later in the morning Tuesday and may actually move back eastward toward London early in the afternoon before breaking up.
A second Lake Huron band may get organized just north of the Hanover region late in the afternoon Tuesday and this band should shift south and southwest later in the evening. Snowfall amounts under that band will likely be in the 10 cm or less range. But as is always the case, trying to predict snowfall amounts for specific areas under these narrow, shifting bands of snow is incredibly challenging.
A third, small band of snow off Georgian Bay will stretch from the Blue Mountains/Wasaga Beach area and extend southeast overnight tonight/early Tuesday perhaps as far as the Newmarket area, but this particular band will be weak compared to the Huron band and thus snowfall will average mostly under 8 cm for most areas, with the highest amounts closer to Georgian Bay and amounts closer to 2-5 cm from New Tecumseth to Newmarket.
Expect some snow showers and flurries for Toronto proper Tuesday morning.
A snow and wind recap of the blizzard which impacted the Canadian Maritimes.
Snow will overspread Ontario late Wednesday night or early Thursday then reach Quebec later Thursday and Thursday night.
Monday afternoon update on the impending snowstorm for Atlantic Canada and the next system for midweek in eastern Canada.
A look at the next two snowstorms and the long-range forecast model update...
A coastal storm will bring accumulating snow to parts of Atlantic Canada from Thursday afternoon into early Friday.
A new pdate on the quick-moving snowstorm coming for parts of Quebec later today into early Monday.