Arctic air will sweep across western Canada and parts of the US early this week, leading to a cold snap that will probably last through the rest of this week and possibly beyond.
By Wednesday, temperatures in western Canada could be as much as 10-15C below the seasonal average. Minimum temperatures in Calgary and Edmonton could plummet as low as -30C by Friday, with some rural areas experiencing even lower temperatures. In contrast, temperatures on the east coast will be significantly above average, with Ottawa reaching highs of about 5C, almost 10C above the seasonal average. The cold spell will spread into northern and western parts of the US by Friday, with temperatures widely reaching 5-15C below average.
