Another storm on the way for southern Quebec

We are in for another round of rain, wind and wet snow this Sunday into Monday morning across southern Quebec. There are still many details to work out, but the possibility exists for more tree damage and power outages as occurred this past Monday across the region and in Verdun, shown above. (J Balena)

A very complex weather scenario is expected for the upcoming weekend, that will include much milder air as well as a mix of precipitation. There are many moving parts to this forecast, so check back for updates. Before then, we will have one more chilly, damp day on Friday, with clouds, a few flurries, and a high temperature of -5C (23F).

Over the weekend, a deep trough will set up across the mid Mississippi Valley, with moisture and very warm air streaming northeast into the Great Lakes, Ontario and southern Quebec. Cloudy skies Saturday will yield to flurries and even some drizzle Saturday night and Sunday. Temperatures will rise above freezing Saturday to 2C (36F) and even milder Sunday at 5C (41F).

By Sunday, a strong cold front will begin moving across Ontario into western Quebec. Along and ahead of the front a surge of moisture will bring in excess of 25mm (1 inch) of rain to the Montreal region. With the rain and mild temperatures, we can expect significant snowmelt from last weeks storm. Some local flooding is possible.

By the evening hours, deepening low pressure will begin moving along the aforementioned front and across eastern New England. As the storm moves into Atlantic Canada, colder air will surge in behind, changing rain to wet snow. The changeover should occur Sunday evening in Montreal, with the potential for some significant snowfall in several parts of southern and western Quebec, including Montreal. Accompanying the precipitation on Sunday will be gusty southwest winds, that will back to the northwest and become strong late Sunday, up to 60km/h.

Precipitation will taper off by Monday morning. This storm has the potential to produce a mixed bag of dangerous weather, ranging from strong winds, heavy rain and flooding, to icy roads and possible power outages by Monday. Keep informed and watch for additional weather headlines and warnings that may be required at some point over the weekend.