The Weather Network – Hottest days of the year in southern Ontario with risk of severe storms – .

The Weather Network – Hottest days of the year in southern Ontario with risk of severe storms – .

Tuesday, August 24, 2021, 8:48 p.m. – Wednesday could bring the hottest temperatures of the year so far in parts of southern Ontario as uncertainty remains over the timing of the possibility of thunderstorms.

Another day with the mass of hot air and soup is expected Wednesday in southern Ontario, with widespread heat warnings still in place. It has the potential to be the hottest day of the year so far in some places, including Toronto. Temperatures will climb to the lows in the mid-1930s, but humid values ​​will look like they are in the low 40s. In addition, there is the potential for severe thunderstorms on Wednesday, but a lot of uncertainties remain. on the calendar. More information on the storm risk and when the region will break up from the tropical heat and humidity, below.


Stubborn heat and humid conditions will hold sway over southern Ontario and Quebec on Wednesday. Heat warnings extend from southwestern Ontario to southern Quebec, with daytime highs between 30 and 30 throughout the region. The values ​​felt reach the first 40 years.

In fact, Wednesday could be the hottest day of the year so far. While August 25, 1948 had Toronto’s highest daily temperature (38.3 ° C), it is not expected to be exceeded by this date this year. However, if the city hits 34C on Wednesday, it will be the hottest day of 2021 so far.

A storm complex that developed in Michigan on Tuesday evening has a chance of maintaining its makeup to reach southwestern Ontario by late evening, perhaps with severe criteria.

On Wednesday there may be more rain showers or scattered thunderstorms, although most of the day seems to stay dry and many places lack the much needed rain. Some of the thunderstorms may reach severe limits in the south.

However, the timing of the storm threat is very uncertain. There is the possibility of an early morning round of a decaying MCS (mesoscale convective system) and the risk of rearrangement in the afternoon and evening.

So far this month, less than 25mm of rain has been recorded at Toronto’s Pearson Airport.


Tropical humidity will continue to fuel the storm threat through Thursday, with a higher risk of passing showers and thunderstorms at certain times of the day.


A tricky temperature forecast for Friday and Saturday, as a rather stark temperature contrast across a border will descend southward on Thursday and Friday, then slowly rise northward across the region on weekends.

This limit will also be at the center of a few series of showers and thunderstorms. Autumn weather north of the border versus hot and very humid in the south.

“Critical differences between models for Friday and Saturday for the cottage region, Algonquin, Eastern Ontario and Southern Quebec – the model scenarios vary from cool and humid to hot and humid. The hottest scenario, with the front further north, is preferred at this stage, but low confidence forecasts, ”said Dr Doug Gillham, meteorologist at MétéoMédia.

Hot, humid and unstable weather early next week. Warm weather is expected to dominate next week with the potential for hot and humid conditions again this weekend.

Stay with The Weather Network for the latest forecasts across Ontario.


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