
Snow squall warnings line southern Ontario amid deep Arctic chill
Plenty of snow is on the way as bitterly cold temperatures spawn snow squalls off the still-unfrozen lakes
The outbreak of Arctic air surging across Ontario will kick off potent snow squalls to start the week, prompting forecasters to issue snow squall warnings and watches for some regions.
Parts of southern Ontario may see more than 30 cm of accumulation from this latest lake-effect snowfall event.
If you're planning on travelling, be wary of poor visibility during periods of snow and slippery road conditions from icy surfaces. And, if you're planning on going outside, bundle up with extra layers and limit exposure to the cold.

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The Arctic airmass currently in place across Ontario will stick around through Wednesday, with the coldest temperatures expected Monday and Tuesday.
Extreme cold warnings encompass all of northern Ontario, where dangerous and life-threatening wind chills as low as -50 are anticipated. Frostbite can develop in a matter of minutes in this kind of cold.
Tuesday's daytime high of -14°C will be Toronto’s coldest daytime high since January 2019. It’s been much colder, though. Flashback to Jan. 15, 1994, when the temperature peaked at just -21°C at Pearson International Airport.

Folks across southern Ontario will contend with daytime high temperatures in the minus teens through Monday, with even colder wind chill values making it an uncomfortably—and dangerously—cold day throughout the region.
Multi-day, lake-effect snowfall event sets up
The Great Lakes remain largely unfrozen heading into this latest cold snap. At the moment, Lake Huron is sitting at 4°C, Lake Erie is at 3°C and Lake Ontario is hovering at 1°C.
Frigid winds blowing across the still-unfrozen lakes will kickstart a renewed round of lake-effect snow over the next couple of days.

A wind shift from Monday into Tuesday will trigger additional bands of lake-effect snow off Georgian Bay, Lake Erie, and Lake Ontario.
A snow squall warning is in place for the Lake Huron and southern Georgian Bay shores, highlighting the potential for up to 30 cm of snow through Wednesday. Locally higher totals are possible.

"Snow squalls cause weather conditions to vary considerably; changes from clear skies to heavy snow within just a few kilometres are common. Visibility may be suddenly reduced at times in heavy snow," said Environment and Climate Change Canada (ECCC) in the warning.
SEE ALSO: Polar vortex set to invade Canada and the U.S. with dangerous cold
Colder-than-normal temperatures are expected to continue into the final week of January. Milder air will attempt to surge north of the border progressing through the first half of February. It’s too early to know if this will bring a period of early spring-like weather, or if it’ll bring an active storm track with messy storms.