After a weekend that saw a multi-day snow squall event across a good portion of southern Ontario, it will be the Greater Toronto Area's (GTA) turn come Tuesday. A snow squall is expected to develop and drift across the region, including Toronto, potentially disrupting the afternoon and evening commutes. Exercise caution when heading out on the roads and prepare to slow down as visibility will be reduced. This will be the precursor for another, more widespread event Tuesday night and Wednesday. See what you'll need to prepare for this week, below.
This week: Multiple shots of snow as cold settles in
On Tuesday, easterly winds blowing over Lake Ontario are forecast to develop a snow squall that will, at times, target parts of the GTA with brief bursts of snow, slick roads and reduced visibility.
The squall may meander around the shoreline communities through Tuesday with the target towards the Hamilton region, and western and southern parts of the Golden Horseshoe first before sliding north towards Toronto.
Snowfall accumulations are highly variable on how intense the squall develops, how long it locks over a location and also the fact that roads versus grassy surfaces may accumulate snowfall at different rates.
From flurries to a light dusting, even as much as 5-15 cm of snow is not out of the question for parts of the GTA.
That won't be it for the snow, either, as another round will move in with an inbound low-pressure system. It will spread precipitation across southern Ontario on Tuesday overnight and linger through early Wednesday.
It will be the first widespread, wet snow threat for southern Ontario this season, and will be the first snowfall for Montreal, Que., later on Wednesday. It could drop another 5-10 cm of snow.
Typical of mid-November events, temperatures will be marginal with accumulations highly impacted by elevation and distance from the Great Lakes.
WATCH: Break out the shovels, Ontario, accumulating snow is on the way
Meanwhile, widespread below seasonal conditions are set to dominate this week and beyond, with another reinforcing shot of Arctic air and temperatures more typical of early December at times.
Temperatures on Friday and Saturday will be more typical of early to mid-December. Blustery conditions will end the week along with another round of lake-effect snow in the snowbelts.
Lake-effect snow squalls will linger through the weekend and into early next week. This will be a high-impact, multi-day event, which will pose a problem for travel for the highest-impacted areas east of Georgian Bay and Lake Huron. The hardest-hit regions could be the Buffalo and Watertown areas, with the potential for snow totals to be exceeding 50 cm.
We will closely watch southern parts of the Niagara region as the heavy snow squall could drift north into this region at times.
WATCH: These snow squalls gave southern Ontario its first wintry weekend
Be sure to check back for the latest weather updates across Ontario.