As I have been stating over the past few days, behind the Thursday/Friday storm there will be a period of heavier lake-effect snow for parts of Ontario downwind of Lake Huron and Georgian Bay from Friday evening through midday Saturday.
There will just be enough cold air for the lake effect to get going initially off the southeast end of Lake Huron Friday evening then farther north and east later Friday night.
I outlined the areas where I think there is the best chance of heavy snowfall and areas where there should be at least some lake-effect snow for a period of time.
Since the air is not terribly cold and the lake waters are still fairly mild, there will be less snow right along the lake shores compared to just inland. This is typical for December.
The best chance of lake effect for areas well to the north and northwest of Toronto will be early Saturday morning. I expect snow showers Friday into Saturday morning across much of the GTA.
It's too early to get a really good idea on amounts, but there certainly could be some localized amounts in excess of 30 cm northwest of London by Saturday morning.
The lake effect will wind down from southwest to northeast Saturday midday and afternoon as drier air works in.
I worked from home Wednesday, but I will be back in the office Thursday and we will make any necessary updates to the storm snowfall map for the rest of eastern Canada for Thursday night through Saturday morning.
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Storm will bring blizzard conditions to parts of New Brunswick and P.E.I. by early Thursday morning.
Intense, quick-moving storm will bring heavy snow and strong winds to the Maritimes later Thursday and Thursday night.