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Ontario: Snow squalls threaten dangerous driving conditions through Friday

Thursday, November 7th 2019, 9:29 pm - Friday's dangerous snow squalls threaten up to 40 cm in some spots.

Southern Ontario is set to see another day of snow squalls and chilly temperatures after the first widespread snow officially arrived to the region on Thursday. The traditional snowbelt region is seeing the risk for dangerous lake-effect snow and even the chance for some to see over 40 cm accumulate. Details and timing, below.

Time to prepare for the season ahead! The Weather Network's Winter Forecast launches Monday, November 18.


  • Snow squalls threaten poor visibility for drivers through Friday
  • Colder-than-average temperatures dominate first weeks of November
  • Stay up-to-date on the ALERTS in your area


Weather Network meteorologist Tyler Hamilton describes Friday's snow squalls as "incredibly dangerous" for certain roadways in southwestern Ontario due to poor to no visibility for drivers on Friday.

MUST READ: Rounds of cold air promise a snowy, tumultuous month

Winds blowing over still relatively warm Georgian Bay and Lake Huron will precipitate lake-effect snow, blowing well inland of those areas. Grand Bend, Goderich, and other regions along the shores of Lake Huron are seeing the risk for these dangerous snow squalls during the morning hours, however this threat will continue into the start of the weekend.

Presently, it looks like the heaviest bands could deliver as much as 20-40 cm of snow for some areas through Friday, with squalls lingering even into Saturday morning.

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The locally heavy snow combined with strong winds are expected to result in reduced visibilities and difficult travel, especially along stretches of Highway 401 and 402 in the London area, where localized totals will exceed 30 cm by Friday afternoon. Snow squall warnings are currently in effect.

"Snow squalls cause weather conditions to vary considerably; changes from clear skies to heavy snow within just a few kilometres are common," Environment Canada says in the warning. "Prepare for quickly changing and deteriorating travel conditions."

MUST READ: Typhoon Halong hampers any dream of a notable November warm-up


Daytime highs look to climb above freezing on Friday -- barely -- though wind chill values will feel several degrees below.

"Narrow bands of lake-effect snow will also continue southeast of Lake Huron and Georgian Bay and could extend into parts of the GTA at times with heavier flurries," meteorologist Dr. Doug Gillham says.

After a brief warm-up and scattered rain showers on Sunday, another cold front will send temperatures back below seasonal with a gusty wind adding a significant wind chill into next week.


"These temperatures are more typical of mid to late December," says Gillham, adding that a system tracking south of the Great Lakes on Monday has the potential to bring a widespread snow across the region.

"There's the potential for significant snow totals, especially across southern parts of our region."

Although the cold pattern looks to relax at times during late November, overall the chilly pattern is set to dominate right through the end of the month.

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