Below seasonal temperatures across Eastern Canada continue into the week
May is coming to a close on a chilly, more spring-like note as temperatures drop and frost advisories are issued
In fact, for parts of Eastern Canada, overnight lows will dip to values that could bring frost in the next several days. The expected chills have prompted Environment and Climate Change Canada (ECCC) to issue frost advisories across parts of Ontario, Quebec, and Nova Scotia.
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Frost advisories are issued when temperatures are expected to reach the freezing mark during the growing season, leading to potential damage and destruction to plants and crops.
Tuesday through Thursday
A cold front, descending from Canada’s North, brings showers across Ontario and Quebec late Tuesday, through Wednesday. Behind it, temperatures more reminiscent of April are likely to close out the month of May and the workweek ahead. Both Ontario and Quebec will struggle to reach the teens on Wednesday, and most of Eastern Canada sits 5 to 10 degrees below seasonal. Thursday does not see much of an improvement.
A heavy frost will once again return to northeastern Ontario by Wednesday morning as the sharp cold front tracks in.
Another trough gives temperatures near the freezing mark, even across southern Ontario, including Barrie and the Dundalk Highlands, by Thursday morning. Algonquin Park will be a frosty affair, and regions across northeastern Ontario will likely fall below the freezing mark.
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Some lingering morning frost for Friday is in the cards across Ontario, Quebec and parts of Atlantic Canada as the trough becomes cut off from the main flow, keeping temperatures seasonably chilly.
Prepare
When you’re driving, pay attention to when your car’s thermometer falling to three degrees or lower, as temperatures near the ground are likely cooler.
Frost may damage some crops in frost-prone areas. Cover up plants, especially those in frost-prone areas.
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Storm analysis
After the cold front slid through on Monday, a trough has been left behind in southern Ontario and Quebec. You’ll notice the effects of the trough at the surface by Thursday, pushing temperatures as much as 10 degrees below normal across Quebec, and 5-8 degrees below normal across southern Ontario.
A bizarre temperature reversal is in store for Atlantic Canada, with Newfoundland actually trending above normal on Thursday, while the Maritimes suffer under the trough.
It means parts of Newfoundland will surge close to 20 degrees while other provinces farther west struggle to get much into the double digits for highs.
Stay tuned to The Weather Network for the latest forecast updates for Eastern Canada.
With files from Tyler Hamilton, a meteorologist at The Weather Network.