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After potent snow squalls, eyes on a more widespread shot of snow for Ontario

Saturday, February 13th 2021, 9:14 pm - Southern Ontario is dealing with everything winter has to offer Saturday -- from the extreme cold to heavy, lake-effect snow squalls, possibly bringing hefty accumulations for parts of the GTA.

Very heavy and prolonged snow squalls made travel a nightmare for communities along the western edge of Lake Ontario Saturday, but a fair start to Sunday should give people a chance to dig out somewhat. Beyond is a weak system arriving Sunday night, but a potentially more impactful system will brush the province Monday night, bringing another widespread shot of snow, heaviest for the Niagara region. For a more detailed look, see below.


  • Squalls end overnight, fair start to Sunday
  • Weak system moves through Sunday night to Monday, widespread snow
  • Heavier snow expected from a U.S. system that will clip the province Monday night into Tuesday


Sunday's temperatures look to be somewhat milder compared to the deep freeze that's gripped Ontario for much of the past week, though daytime highs will still be several degrees below zero, and with wind chills making it still feel colder than -10.

As for Saturday's snows, aside from the impressive and long-lived snow squalls that slammed the Golden Horseshoe for a second day, a general snowfall from a passing weak system will be mostly done by Sunday morning.

As for Sunday itself, it will certainly seem like an improvement as fair conditions return, but cloudy conditions return through the afternoon and evening ahead of another approaching system.


This one looks to be slightly more potent, with some 5-10 cm across the province Sunday night through to Monday, heaviest for the southwest close to Lake Huron and Georgian Bay.


While this will be a weak system, a more significant storm is possible Monday night into for southern Ontario, as a major winter system tracks south of the border. The system itself doesn't look to cross southern Ontario, but its northern edge will brush the province.

Amounts will be heaviest for areas closest the U.S., with 10-15 cm for the southwest from Windsor to Hamilton and from Peterborough to Cornwall, but up to 20 cm for the Niagara region.

ON Snow

Beyond, forecasters are eyeing a late-week system. While there's currently low confidence in the snow forecast, it'll still be a storm to keep an eye on as the week progresses, Weather Network meteorologist Dr. Doug Gillham says.

"Because if this storm verifies, our seven-day snowfall totals for parts of southern Ontario could be rather impressive with the parade of storms," says Gillham.

At this point it looks like near normal or colder than normal temperatures will dominate for the final week of February.

Thumbnail courtesy Mark Robinson

Be sure to check back for the latest on the winter weather in Ontario.

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