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Tracking: Rain for Ontario ahead of potent weekend storm

Digital writers

Tuesday, November 14, 2017, 5:50 PM - Ontarians will be eased into this weekends potent fall storm by some rainfall to wrap up the work week.

Read on as we take a look at the upcoming forecast.

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5-10 mm of rain is forecast for Wednesday to the south, as well as 5-8 cm snow snow in northern Ontario. Showers will eventually push into eastern Ontario and southern Quebec by Wednesday evening, with wet snow likely for areas north of the St. Lawrence overnight into Thursday.

Behind the cold front, winds out of the northwest will generate some lake-effect showers over central and southern Ontario, though thanks to the bump in temperatures, they should fall mainly in the form of rain rather than snow.

High pressure builds in again behind this system, meaning a return to clearer skies on Thursday.

Potent weekend system

Looking ahead to the weekend, a classic late fall storm is expected to track into the Great Lakes and Quebec as a Colorado low intensifies as it pushes into the region Friday afternoon.

"Southern Ontario will be in the warm sector, but cottage country, eastern Ontario and southern Quebec could see a brief period of snow and ice before changing over to rain," says The Weather Network meteorologist Dr. Doug Gillham.

"This system will bring strong winds and rain (thunder possible) for southern Ontario followed by colder temperatures arriving Saturday night into Sunday."

As temperatures drop, conditions will be favourable for a much more extended lake-effect event.

"However, a shot of colder air is expected for the middle of next week with the potential for more significant lake effect snow," adds Gillham. "Also watching the potential for more widespread snow."

Meanwhile, parts of northern Ontario could see 20+ cm of snow Friday through the weekend. 

Be sure to check back for updates as we continue to monitor the forecast.

With files from Brad Rousseau

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