We’re already on the lookout for another disruptive winter storm looming for the weekend—and that’s before the snow from Thursday’s storm even had a chance to settle on the ground.
A Colorado low sweeping through the northern United States will spill hazardous conditions into Ontario, Quebec, and Atlantic Canada through this weekend. Widespread heavy snow is likely, while some communities will contend with a messy mix of icy precipitation.
As always, be sure to keep up-to-date on your local weather alerts, and always check the highway conditions before heading out.
PHOTOS: Major Ontario cities, GTA get a snow day as 20+ cm blankets region
Saturday: Ontario pre-show snow, U.S. severe storm outbreak
A low-pressure system developing over Colorado on Friday will steadily move east across the northern half of the United States into the beginning of the weekend.
Colorado low Saturday 4pm precipitation
Before that system arrives, though, we’ll see a weak disturbance move into Ontario with a batch of light snow spreading into the afternoon hours. This is the precursor to the main event arriving overnight.
Snowbirds and travellers in the southern United States should keep a watchful eye to the sky as this Colorado low will spark a threat for widespread severe thunderstorms through the day Saturday.
Colorado low SPC severe weather outlook Saturday
Cities from Houston to Atlanta could see dangerous thunderstorms develop through the day Saturday. The greatest risk for severe weather will exist from northern Louisiana through central Alabama, where damaging wind gusts, large hail, and tornadoes are all possible.
Sunday: Heavy snow hits Toronto, Ottawa, Montreal
Our major system will swing through southern and eastern Ontario through the overnight hours Saturday into Sunday, with widespread heavy snow expected into Sunday morning.
Colorado low Ontario snow outlook
There’s lower confidence in exact snowfall totals right now, but there is the potential for some areas to see just as much as we saw with the Wednesday-Thursday snowstorm this week.
Communities from London, Hamilton, the Greater Toronto Area, and all the way up toward Ottawa could see 20+ cm of snow from this system. Some northern areas will likely see less snow from this weekend’s system.
Folks throughout southern Quebec, including Metro Montreal, will see heavy snow overspread the region throughout the day Sunday.
It’s possible that Gatineau, Montreal, Sherbrooke, and Quebec City could all see 20+ cm of snow from this system Sunday into Monday.
Colorado low Sunday 7pm precipitation
Snow will spill into the western Maritimes on Sunday afternoon, engulfing the region through the evening hours. The centre of the low will track through the Maritimes, which will bring some mixed precipitation to southern sections of the area.
There’s some uncertainty on where that snow/mix line will set up—similar to Thursday’s system. It’s likely that areas that see all-snow will have some hefty shovelling to do by the end of the storm.
Monday and beyond: Newfoundland snow, frigid air spills in
The system will lift northeast into Monday, bringing yet another heavy swath of snow to parts of Newfoundland to start the week.
A surge of frigid air will spill in behind the storm as northwesterly winds blow across Eastern Canada. Air temperatures on Tuesday morning will likely dive into the -20s for much of Ontario, with the -10s likely into the Greater Toronto Area and the National Capital Region.
Stay with The Weather Network for the latest forecast updates on this developing storm.
WATCH: Ontario’s snow day meant work, play, and headaches
Click here to view the video
