Coldest air of the season sweeping across Canada

The forecast movement of the arctic air across North America this week. The coldest air of the season to date, will arrive in Montreal by Friday. (AccuWeather)

A burst of arctic air is rushing into western Canada this morning. The temperature in Isachsen, Nunavut is -38.7C, the coldest in the country. That Siberian air is currently moving south into Alberta and Saskatchewan. Temperatures will fall all day in Edmonton, down to -19C (-2F), with overnight lows in the minus 20s. The leading edge of cold air is producing moderate snow and blowing snow in southern Saskatchewan, with windchill values down into the -20s. The cold air will sweep across the entire country by next weekend.

Meanwhile, here in Montreal, light snow has made a mess of the Monday-morning commute. Numerous accidents, on slick highways, have created long delays getting into the city. The snow should taper off by noon, as weak low pressure slides east of Montreal. Accumulations will be in the 5 to 7cm range across the region. The high today will be around -2C (29F), with the low tonight under clearing skies near -3C (27F). High pressure briefly builds into southern Quebec on Tuesday, with some much needed sunshine. By Wednesday, another warm front will bring the chance for light snow or rain, as temperatures nudge above the freezing point. This will be short lived, as the aforementioned arctic front arrives late Thursday with a burst of snow and dropping temperatures. By next Saturday, the high in Montreal will only be around -8C (18F), with overnight lows approaching -18C (0F) in the region. As I have mentioned often, this December will bear no resemblance to last year. The cold weather will moderate slightly next week, but temperatures will remain at or below the normal high of -3C (27F).