From the mountain passes of British Columbia to Labrador, November in Canada appears to start with a big snowfall.

Following a late October spell of warm air that swept across parts of northern Canada, setting a record for the warmest October on record in Nunavut, a mass of Antarctic air is moving in over the next few days, bringing with it a cold, wintry blast that will increase the likelihood of snow this week across Canada.

Only two provinces are projected to be snow-free; the remainder will require packages of winter clothing and shovels.

The prediction varies by area

British Columbia

This season, British Columbia has seen its fair share of snow.  Alpine snow builds quickly in the province's mountains at this time of year, due to Pacific moisture that sweeps across the higher altitudes.

An vigorous jet stream over the Pacific will continue to transport precipitation inland, delivering heavy snow to the higher altitudes Monday night and Wednesday.  Prairie

This week, moisture from the Pacific Ocean over British Columbia will enhance the likelihood of snowfall on the Prairie.  The moisture and energy transported by the jet stream will pass the Rocky Mountains, causing a wind shear system across Alberta by late Wednesday.

The wind shear is forecast to deliver snow to the northern and central prairies, affecting the Yellowhead Highway region.

The areas hit by snow, as well as the total amount, will be determined by the wind shear system's route, which may alter in future days.

Ontario

There is a low possibility of snow in Ontario this week, with the first falling on Sunday in the northern region of northwestern Ontario.

The coldest air will persist over Hudson Bay, so snowfall is expected to linger north of Thunder Bay and Timmins early this week.

However, a modest alteration in the storm's course later this week will move the cold air and snow chances southward.  A low-pressure system will then take advantage of the chilly air over the Great Lakes, boosting the likelihood of snow over the Great Lakes basin.

Quebec

There will be plenty of snow in Quebec this week, with the majority of the province anticipated to receive at least some flurries due to the cold air flowing in from Hudson Bay.

On Monday, wet snow is forecast north of the Sept-Îles, and by Tuesday, the snow danger will stretch throughout the Laurentian Mountains north of Quebec City.

By Thursday, colder air will flow into the province via an upper-level low, raising the likelihood of isolated snow showers in the province's central areas.

Atlantic Canada

Labrador saw considerable snowfall over the weekend, which will continue over the weekend.

We may possibly experience snow in western Newfoundland.

The Maritime provinces are preparing for two wet weather systems that are likely to blow through the area this week.

Parts of northern New Brunswick may receive wet precipitation as cold air comes in from Quebec, but the majority of the province is forecast to remain snow-free.

The only two provinces that are not likely to get snow this week are Prince Edward Island and Nova Scotia, due to a mass of warm Atlantic air over the area that is delaying the arrival of frigid Arctic air that has been attempting to push south.