Snow expected for the Tuesday morning commute in Montreal

Another round of accumulating snow is forecast for the Tuesday morning commute in Montreal. Allow extra time on Tuesday morning, with 5 to 10cm expected for the city.

Snowfall Warning in effect for the Laurentians, Lachute, St Jerome and Quebec City
Winter Weather Advisory for the Ottawa and St. Lawrence Valley

The temperature roller coaster ride will persist this week, as it has all winter long. High pressure has been in control of our weather Monday, with abundant sunshine and seasonable temperatures. Clear skies will prevail into the evening hours, with temperatures dropping quickly after sunset to early lows of -13C (9F) in Montreal.

Clouds will be on the increase after midnight as developing low pressure moves from the southern plains into the Great Lakes. A warm front will lift north with the storm system, producing and area of light to moderate snowfall. The snow will move into Ontario overnight and unfortunately approach Montreal in time for the morning commute. Accumulations of 5 to 10cm are likely along the St. Lawrence River, with 15-20cm north of Laval into the lower Laurentians. These regions are under snowfall warnings. A weather advisory is in effect for the St. Lawrence Valley in Ontario.

The timing of the snow will result in another slow morning commute in southern Quebec. Look for snow covered roads and reduced visibility. Precipitation should taper off in the the afternoon, as temperatures rise to the freezing point. Winds are expected to pick up as well on Tuesday afternoon, gusting between 40 and 60km/h in Montreal.

The temperature will briefly rise above freezing up to 3C (38F) during the evening hours, as the warm front lifts north of the valley. A few isolated showers are possible, changing back to flurries as the  temperatures drops once again below freezing, down to -5C (23F) by Wednesday morning.