Saturday, November 18, 2017

Freezing rain warning for southern Quebec

Freezing rain warnings are in place for southern Quebec this afternoon and tonight.
Strengthening low pressure will rapidly move from the central plains into the Great Lakes tonight, and down the St. Lawrence Valley on Sunday. Waves of precipitation are expected over the next 24 to 36 hours from southern Ontario into Quebec. Along the path of the storm, mixed precipitation is forecast. North and west of the system, snow will be the dominate precipitation, with as much as 25cm expected in the Laurentians and upper Ottawa Valley. South of the track towards the US border and in the Townships, look for mostly rain.

Freezing Rain Warning
Environment Canada has a wide range of warnings in effect for this afternoon and especially overnight. In Montreal, a freezing rain warning has been posted. A mix of snow and rain this afternoon, will transition to rain tonight as the temperature rises from -2C (28F) up to 4C (39F) by morning. Expect between 2-4mm of ice in Montreal. North of the city and in Ottawa, the freezing rain will last longer, with as much as 15mm possible. In Ottawa, the rain will change back to snow overnight, with as much as 10cm before it ends on Sunday. As the storm moves east of Montreal on Sunday, a strong cold front will sweep the region. Cold air will surge back into Ontario and southern Quebec, with any mixed precipitation changing back to all snow and ending in the afternoon. A couple of centimeters of snow are possible in the St. Lawrence Valley Sunday. Temperatures will fall back below freezing by noon on Sunday. Strong winds will also develop on Sunday, gusting up to 60km/h across the entire area. Travel will be highly variable and quite dangerous at times this weekend. Expect icy patches in the city. North and west of Montreal, conditions will quickly deteriorate, with lowering visibility and snow covered roads. The weather will improve on Monday.

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