The Weather Network – Spring snow impacts movement and early blooms in southern Ontario



Wednesday, April 21, 2021, 7:57 a.m. – Travel not recommended as decent April snow makes it difficult to travel in southern Ontario on Wednesday.

Winter travel advisories remain in effect in parts of southern Ontario Wednesday morning, with drivers being urged to postpone any non-essential travel as heavy and wet snow complicates travel times. Travel will also remain difficult in the Greater Toronto Area and Niagara Region until midday, before snow gradually penetrates eastern Ontario and Quebec in the afternoon. Although the snow subsides throughout the day, the drop in temperatures Wednesday night could once again lead to slippery and icy conditions on Thursday morning. More information on what remains of this late-season snow, below.


An American system made its way south of the lower Great Lakes overnight Tuesday, and with cooler air to work on, the low brought a band of late-season snow.

While some areas have already reported several inches of significant humidity overnight, (especially on grassy and elevated areas), snow accumulations will be quite variable, as it will be more difficult for snow to accumulate. on some hotter surfaces.

The greatest accumulation is expected to be in the Niagara region as periods of moderate snow pass through the region during the morning hours.

Snow had subsided in the southwest before the morning trip, but travel will remain difficult in the Greater Toronto Area and Niagara until midday. Snow will then continue to grow in eastern Ontario and Quebec throughout the afternoon.


Overall, total snowfall forecast will be in the range of 2 to 5 cm in the GTA. Accumulations around the eastern and western ends of Lake Ontario could be somewhat higher. Cobourg could see 5cm, Hamilton will be in the 5-10cm range, with as much as 10-15cm as possible across the Niagara Peninsula by the time all is said and done.

The further north you travel from the Highway 401 corridor, the less snowfall amounts are expected, as the center of the low remains south of the border.

SEE ALSO: Spring is here, so when should you take off your winter tires?

As the snow subsides, a few sun breaks will be possible, helping temperatures rise above freezing by Wednesday afternoon, leading to slush conditions.


“Temperatures will drop below freezing again overnight, which could lead to slippery sidewalks and icy conditions on untreated surfaces Thursday morning,” warns Michael Carter, meteorologist at MétéoMédia.


Cool, below-season temperatures will also persist Thursday in the wake of this system, with severe frost being a big concern in the Niagara region in particular as flowers have already emerged in many orchards. In addition, there will be lake effect snow showers.

Plentiful sunshine and warmer, near-season temperatures return for Friday, however, as acceptable conditions begin at the weekend.

“So while this week’s snowfall is likely to be disruptive given the time of year, it won’t last long,” Carter adds.

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By Friday, there will be plenty of sunshine and a dramatic rebound in temperatures, particularly in southern Ontario, with widespread daytime highs reaching into mid-teens. Saturday will also feature sunny conditions and close seasonal temperatures, making it a pleasant spring day across the region.

However, the next system will follow the region on Saturday evening, with heavy rain likely. Rain will end early Sunday morning for southern areas, but the system’s slow easterly track will bring rain to eastern Ontario on Sunday, which may persist until Monday.

Beyond the weekend, a brief warm-up is scheduled for the middle of next week, but it feels like another cold snap by the end of the week, as we move from April to May.

Check back for updates on the latest spring conditions in Ontario.


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