Another mixed precipitation winter storm for Montreal

Low pressure and a strong warm front will produce a period of steady snow tonight in Montreal. We can expect 5 to 10cm in Montreal and across the Ottawa Valley, with more falling to the north of both cities. Strong winds will accompany the snow, producing areas of blowing snow and reduced visibility. (AccuWeather)

Snowfall Warning: Mont Tremblant, Sainte-Agathe, Sainte-Adele
Wind Warning: Richelieu Valley

The current weather pattern that has been well established since early December, will deal another mixed precipitation event to Montreal and the St. Lawrence Valley. A winter storm developing over the central US, will move towards the Great Lakes and just south of Montreal on Tuesday. A surge of warm, moist air is anticipated in advance of the low pressure. Snow will develop this evening in eastern Ontario and by midnight in Montreal. A decent swath of 5 to 10cm should be on the ground by the Tuesday morning commute, with 15 to 20cm expected north of the city across the Laurentians and into western Quebec.

The snow will mix with and gradually change over to freezing drizzle in Montreal tomorrow morning, and finally rain showers by noon on Tuesday. The temperature will do another wild roller coaster ride in Montreal, rising from this mornings low of -17C (2F), up to -5C (23F) by Tuesday morning and eventually above freezing to 2C (36F) by Tuesday afternoon. Accompanying the precipitation will be strong winds in excess of 50km/h in Montreal, and over 90km/h in the Richelieu Valley south and east of the city. As the low pressure moves east of Montreal, colder air will return, changing precipitation back to snow late Tuesday night. Further accumulations are likely into Wednesday. Much colder air will return by the end of the week, with daytime highs by Friday expected to be well below the normal of -6C.