<div itemscope itemtype="https://schema.org/VideoObject"><meta itemprop="uploadDate" content="Sat Aug 06 2022 19:12:18 GMT-0300 (Atlantic Daylight Time)"/><meta itemprop="name" content="Toronto feels hotter than Caribbean Islands, flash flood risk grows"/><meta itemprop="description" content="Extreme humidity and heat warnings may pop into severe thunderstorms Sunday into Monday with dangerous flash flood risks for Ontario and Quebec. Meteorologist Rachel Modestino has the details"/><meta itemprop="duration" content="P0Y0M0DT0H1M10S" /><meta itemprop="thumbnailUrl" content="https://content.jwplatform.com/thumbs/BEMpVoEq-1920.jpg"/><meta itemprop="contentUrl" content="https://content.jwplatform.com/videos/BEMpVoEq-JXpetW4I.mp4"/><script src="https://cdn.jwplayer.com/players/BEMpVoEq-vjKMklPp.js"></script></div>

Millions of people across southern Ontario and Quebec have been under heat warnings this weekend. An extremely hot, humid and uncomfortable air mass will stick around, continuing to feed a thunderstorm threat across Central Canada, as well. Due to the high humidity and atmospheric moisture content, storms that do develop will have the ability to produce torrential rainfall -- increasing the chance of localized flooding. The threat of storms will be localized, however. For details on the heat, humidity and thunderstorm risks for the rest of the weekend, read below.

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### __Saturday: Hot, muggy conditions set the scene for Sunday’s storm risk__

Good portions of southern Ontario and Quebec were covered by heat warnings Saturday. The temperatures are expected to continue in the low 30s with overnight temperatures not dropping any lower than the low- to mid-20s, offering little relief at night. Humidex values are expected to reach the low 40s. In the Greater Toronto area Sunday will feel a few degrees warmer than Saturday where the region topped out with a humidex of 40.

![ONTHUMAUG7](//images.ctfassets.net/c55i45ef3o2a/ZVKpaSklbTPN5tqaFCjpf/d44cc3ba8ea634422080a9b796260435/ONTHUMAUG7.png)

As the heat and humidity rise, so, too, does the chance of thunderstorms.

### __Sunday: Heat continues, higher threat for storms with heavy rain potential__

On Sunday, a boundary will slowly track south through the day, bringing a better chance of storms to Central Canada. 

Any thunderstorms that do initiate will have the ability to tap into ample amounts of tropical moisture in the atmosphere, producing very heavy rainfall locally as they drift eastward. There will be a risk of localized flooding. In addition, storms may also produce locally gusty winds. 

![ONTHURISKAUG6](//images.ctfassets.net/c55i45ef3o2a/O7rd3yixe76wMRMrXAd3S/b3cf094e0b9c4ade2bf32768cc383ab6/ONTHURISKAUG6.jpg)

The threat of urban and flash-flooding spreads into the Eastern Townships and Montreal, and the abundance of moisture will allow for some severe storms in the regions, extending westward into southeastern Ontario, as well.

The threat of storms will be localized, however, and not everyone will see them or any rain for that matter.

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Beyond the weekend, the active weather pattern will continue into early next week. A developing low-pressure system early Monday will allow for more of a widespread rainfall and thunderstorms across southern Ontario and Quebec, but some regions will miss out on significant rainfall. By Tuesday, active weather wanes and temperatures fall substantially, compared to Monday.

As well, the extreme heat and humidity will ease by the middle and end of next week.

### __WATCH: How a single Ontario storm can skew your perception of summer__

<div itemscope itemtype="https://schema.org/VideoObject"><meta itemprop="uploadDate" content="Thu Aug 04 2022 12:21:38 GMT-0400 (Eastern Daylight Time)"/><meta itemprop="name" content="How a single Ontario storm can skew your perception of summer"/><meta itemprop="description" content="Some parched communities received an entire month&#39;s worth of rain on August 3, while others stayed perfectly dry. Meteorologist Jessie Uppal explains how this localized drenching occurs."/><meta itemprop="duration" content="P0Y0M0DT0H1M12S" /><meta itemprop="thumbnailUrl" content="https://content.jwplatform.com/thumbs/G9UinXXA-1920.jpg"/><meta itemprop="contentUrl" content="https://content.jwplatform.com/videos/G9UinXXA-JXpetW4I.mp4"/><script src="https://cdn.jwplayer.com/players/G9UinXXA-WnAZH7xE.js"></script></div>

*Stay tuned to The Weather Network for the latest forecast details for southern Ontario and Quebec.*

*Thumbnail courtesy of Cathy P., taken in Wilmot, Ont.*

Searing heat, humidity fuels growing storm risk in Ontario and Quebec

Forecasts

The heat could also spark thunderstorms in Central Canada, with the risk of scattered thunderstorms on Sunday.  

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