A double dose of winter is heading for Southern Ontario, demanding residents prepare for a challenging mid-week. Two distinct storm systems are poised to unleash a combination of heavy snow, freezing rain, and treacherous icy conditions across the Greater Toronto Area and beyond.
The first wave, an Alberta clipper, will arrive late Tuesday night or early Wednesday morning, while most are asleep. Expect a rapid onset of snowfall, potentially heavy at times, blanketing the region with 5 to 10 centimetres – and even exceeding 15 centimetres in localized areas.
Reduced visibility will be a significant concern during the Wednesday morning commute. Travel will become demonstrably more difficult, with roads and walkways quickly becoming slick and hazardous. Allow ample extra time for any journey, as navigating the accumulating snow will prove challenging.
Tuesday brought a precursor of what’s to come, with lighter snowfall already impacting southern portions of the province. However, the situation will dramatically shift as the clipper arrives, bringing a more substantial and widespread impact.
A curious twist in the forecast suggests areas closest to Lake Ontario may experience rain instead of snow on Wednesday. Warmer temperatures near the lake will create a melting effect, but this comes with a dangerous consequence: the potential for freezing rain.
Cities along the Lake Ontario shoreline – including Toronto, Mississauga, Oakville, and Oshawa – are bracing for icy conditions. This freezing drizzle will create surfaces that are deceptively slick and difficult to identify, posing a serious risk to pedestrians and drivers alike.
Toronto’s temperature will fluctuate wildly on Wednesday, climbing to a relatively mild 2 C by midday before plummeting to -7 C by evening. This rapid temperature drop will exacerbate the icing threat, solidifying any moisture into treacherous patches of ice.
Patchy freezing drizzle has already begun to develop in some locations, a stark reminder of the conditions rapidly approaching. The colder temperatures are expected to persist throughout the weekend, extending the period of wintry weather.
Looking beyond Wednesday, lake-effect snow is forecast to develop off Lake Huron south of Georgian Bay on Thursday. Communities northwest of the GTA will bear the brunt of this additional snowfall, further complicating travel and winter maintenance efforts.
