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A strong low pressure system that brought a severe weather outbreak to the U.S. Southeast over the weekend continues to track up the East Coast, bringing a messy mix of winter weather to parts of Eastern Canada through Tuesday. Details here
Active Weather Watch: Ontario

Heavy snow, ice pellets hit eastern Ont., southern Que.


Digital writers
theweathernetwork.com

Tuesday, January 24, 2017, 1:12 PM - A strong low-pressure system that brought a severe weather outbreak to the U.S. Southeastover the weekend continues to track up the East Coast, bringing a messy mix of winter weather to parts of Eastern Canada through mid-week.

As the bulk of the system clips eastern Ontario and southern Quebec, there is the potential for some significant snowfall.

Freezing rain has already caused a significant pile-up, involving seven 18-wheeler trucks on Highway 20, eastbound. The highway remains closed Tuesday afternoon near the Ontario border.

Special weather statements are in effect for extreme eastern Ontario, including the nation's capital. Environment Canada has also issued snowfall, winter storm, and freezing rain warnings for parts of southern Quebec, including Metro Montreal, with the potential for 15-25 cm of snow.


Highlights

  • Special weather statements in effect for extreme eastern Ontario for system set to impact the province through the day Tuesday and into the night.
  • Snowfall warnings have been issued for southern Quebec for 15-25 cm of snow expected Tuesday through Wednesday.
  • Eastern GTA could see trace amounts of snow, up to 2 cm of snow, with 10 to 15 cm from Kingston to Ottawa, and 20+ cm going into the St. Lawrence River Valley in southern Quebec.
  • Heaviest swath of snow along the St. Lawrence from Montreal to Trois-Rivières, with potentially up to 30 cm near Trois-Rivières.
  • Snow accumulations in the Eastern Townships will be lower thanks to multiple hours of ice pellets.
  • Colorado low to move into southern Ontario for Wednesday, with several centimetres of snow expected in cottage country.

"Snow will quickly spread into Eastern Ontario [Tuesday] morning then continue for the rest of the day into [Tuesday] evening," Environment Canada said in a special weather statement for Ottawa. "The snow may be mixed with ice pellets and even some brief freezing rain. Total snowfall amounts of 10 to 15 cm are likely before the precipitation moves out [Tuesday] evening."

As the system tracks eastward, the snow will begin to fall in southern Quebec Tuesday and will spread toward central and eastern regions of the province, reaching Montreal by lunchtime. The snow could changeover to ice pellets for some areas.

The highest accumulations in Quebec are expected to be further up the St. Lawrence toward Quebec City, and onto the Gaspe Peninsula, where localized pockets of 25+ cm are expected.

"Weather conditions will improve on Tuesday evening in the southern and central regions of the province, however, snow at times heavy, will continue to fall on Wednesday in the Lower St. Lawrence and along the North Shore," said Environment Canada.


KEEP ON TOP OF ACTIVE WEATHER: Visit the Alerts section of the website


A Colorado low tracking into southern Ontario Wednesday will be the next weather maker for the province, though much of the heavier precipitation looks to skim north of the lower Great Lakes. Cottage country could pick up several more centimetres of snow, but the main impact of the system across southern and southwestern Ontario will be the shift in the winds that follow it.

Colder air from the northwest, as well as a return to lake effect snow, is on tap for late week.

Check back for updates as we continue to monitor the forecast.

WATCH BELOW: Highway 401 crash captured on camera amid snow squall

With files from Caroline Floyd, Daksha Rangan, and Leeanna McLean.

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