|The first snow of the season in Vaudreuil last weekend, did not last long, as warm air returned by mid-week. (ValleyWX)|
That brings us to this weekend, where pretty much the same pattern is in place. The current weather is being produced by a potent cold front slipping across the St. Lawrence Valley. A steady rain in Montreal, will slowly taper to a few flurries tonight. Gusty west winds will increase up to 50km/h this evening. Temperatures in southern Quebec today are in the 5 to 10C (40 to 50F) range. Behind the front, cold air will surge into the region, with lows down to -4C (26F) by Sunday morning. Sunday will be windy and cold, with flurries and temperatures remaining steady. Yet another clipper system will arrive late Sunday into Monday, with some light snow and chilly temperatures. However, the cold will not last long. By Tuesday, more mild air will surge into the region, with temperatures well above normal expected for most of the upcoming week. As long as this flat, zonal pattern remains in place, the arctic air will remain trapped across the far north, with any storm systems being rather weak and moisture starved. I expect a change by the second week of December.