Strengthening southerly wind flow will continue to pump milder air up into southern Ontario tonight and Wednesday. Wind gusts in the range of 70 to 80 km/h are possible late tonight and early Wednesday across southern Ontario, especially along the lake Erie and Ontario shores.
The strong, southerly winds will likely impact the Maritimes very late Wednesday night and early Thursday.
A second area of low pressure will ride northeastward tonight, reaching the thumb of Michigan on Tuesday. Pockets of heavier rain will surge up into the Lake Huron region later tonight before tapering off Tuesday.
North and west of the storm track there will be a band of steady snow. Heaviest snow through Tuesday will streak up just north and west of Sault Ste. Marie.
Cold, Arctic air will quickly wrap in behind the storm through southern Ontario Wednesday evening then later farther to the northeast.
By Thursday morning, the air will be cold enough for the lake-effect bands to set up downwind of the eastern Great Lakes. Right now, it looks like the primary wind direction will be from just slightly north of due west, which put the heavier bands just to the south of Buffalo, N.Y. Lake-effect snow should continue through at least Thursday evening.
The next couple of nights will be very cold across a large portion of the Prairies. The map below shows the expected lows Wednesday night in degrees C. Even though the map does not show it, there will likely be a few spots in Saskatchewan that reach -40 C. There will also be some wind Wednesday night over extreme southern Manitoba which will make it feel more like -40 to -45.
By the way, the latest ECMWF weeklies look a little suspect, but they are strongly showing a dry pattern for the Pacific Northwest and southwest BC for the middle of February.
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Some snow today across southwestern Ontario as the west remains under strong high pressure ridge.
Significant snow is likely for parts of New Brunswick this weekend.
Cold air expected to spill into eastern North America in about 10 to 14 days.
Arctic air likely to retreat well to the north as we go into early December.
Active weather pattern through next week.