Next system could bring the first measurable snowfall to parts of Ontario and Quebec
As we approach the last weekend of November and get even closer to the official winter season, an inbound system will make things look a lot more like winter in parts of Ontario and Quebec. For some regions, including the city of Montreal, this will bring the first measurable snowfall of the season to date. Precipitation will start as rain over much of southern Ontario, with milder temperatures through Thursday, but in the evenings and nights, most places will see a transition to wet snow. Lake-effect snow bands will also return to traditional regions of the snow belt, as a gusty northwest wind picks up for Friday. More information on the timeline and impacts, below.
THURSDAY TO SATURDAY: THE ARRIVING SYSTEM THREATENES MORE THAN 20 CM OF SNOW OVER AREAS OF ONTARIO AND QUEBEC
For the end of November, Wednesday will be rather pleasant across much of southern Ontario, as temperatures hover a few degrees above the season.
As the next system arrives on Thursday, milder temperatures will allow most of the rains to fall in the region, with drier periods also expected during parts of the day.
“However, heavy snow will start over the northern extent of the low pressure system for parts of northeastern Ontario and northwestern Quebec where temperatures will be much colder,” said Kelly Sonnenburg, meteorologist to The Weather Network.
The rain will then turn to mixed or wet snow for parts of southern Ontario and Quebec later Thursday evening, and conditions will also become quite gusty. Eastern Ontario and southern Quebec will see a transition from cold rain to mixed rain and snow until Friday morning.
Cooler temperatures and northwesterly winds on Friday will also allow lakeside snow bands to form for areas southeast of Lake Huron and Georgian Bay where driving conditions could become difficult due to blowing snow and reduced visibility.
“The snow system will continue in eastern Ontario and southern Quebec on Friday, with higher snowfall rates expected in the Eastern Townships and Gaspé,” said Sonnenburg. “Temperatures will drop until Friday evening with the arrival of much colder air for Saturday morning.”
In total, between 10 and 20 cm of snow is expected for the hardest hit areas through Saturday, with regions like Ottawa and Montreal recording their first measurable snowfall of the season, with around 5 cm expected. However, much higher totals are likely to be found just north and east of Montreal.
Wet roads and sidewalks will be very slippery early on Saturday and although conditions improve throughout the day, much colder air will have settled in.
SUNDAY: OBSERVE LOW MOWER AND GENERAL LIGHT SNOW
A relatively weak mower will cross the Great Lakes and southern Ontario on Sunday, with forecasters monitoring the potential for widespread light snow, which could bring 1 to 3 cm.
Temperatures near or slightly below the season will persist through the start and middle of next week, with the potential for a few more mowers to follow in the area. It is still too early to be confident in the trajectory and impacts of these systems.
Be sure to check for the latest weather updates in Ontario and Quebec.