A cold rain will spread across the Midwest, northern Plains and southern Canadian Prairies Wednesday, with widespread temperatures ranging from the mid-30s to the upper 40s. However, as the storm gains strength later Wednesday, it will tap into colder air and drag it southward, causing rain to change to snow. The change will first occur across southern portions of Saskatchewan, Manitoba and southwestern Ontario Wednesday night. Snow will then expand into portions of the Dakotas and Minnesota by Thursday.
As the center of the storm slides northeastward into the Upper Midwest Thursday, it will slow down and even stall near Lake Superior. This will direct prolonged heavy snow toward portions of southwestern Ontario and southern Manitoba. In these areas, more than a foot of snowfall is expected, with an Local amount of 30 inches.
The snowstorm can cause long-lasting travel disruptions in places like Thunder Bay, Ontario, and Winnipeg, Manitoba. Treacherous travel is also likely along the Trans-Canada Highway cutting through southwestern Ontario into southern Manitoba.
Winnipeg has yet to record measurable snow this season, making this autumn the first time since 2016 it has taken until November for the city to receive the first measurable snow, which is 0.1 of an inch or greater. Last year, Winnipeg recorded its first measurable snow on Oct. 16 and had already recorded six days with measurable snow by Nov. 10.
Lighter snow will eventually swing southward around the storm spinning near Lake Superior, reaching the U.S. by Wednesday night and Thursday. While the snow is expected to be lighter in intensity south of the U.S. and Canada border, the wintry precipitation can persist from Thursday through much of Friday, allowing the potential for several inches of snow to pile up over the course of a couple of days. In Fargo and Grand Forks, North Dakota, 3-6 inches of snow is expected from Thursday through Friday.