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The Greater Toronto Area and most major southwestern cities are included. See what to expect.

Heat warning for much of southern Ontario

Daniel Martins
Digital Reporter

Monday, August 25, 2014, 6:50 PM - Environment Canada has issued a heat warning for most of southwestern Ontario, including the entire Greater Toronto Area.

"A hot and humid air mass is expected to affect portions of southwestern Ontario and the Golden Horseshoe on Tuesday," the agency says. "Humidex values neat 40 are forecast for Tuesday afternoon."

Aside from the GTA, the alert is in effect for most major southwestern cities, including Hamilton, Windsor, Guelph and the Kitchener-Waterloo region.

"A cold front will sweep across the area Tuesday night, bringing a return to near-seasonal temperature values for the remainder of the week," Environment Canada says.

In Ontario and Quebec, heat warnings are issued when the temperature is expected to reach 30oC or more, and the humidex is expected to make it feel like 40. 

They are also issued when temperatures are expected to reach 40oC.

People living in the affected areas are encouraged to drink plenty of liquids, and avoid strenuous outdoor activity.

That dense humidity, coupled with the incoming cold front, could spark thunderstorms, potentially severe.

On Monday, storms are also expected in northwestern Ontario, where severe thunderstorm watches were in effect.

TUNE IN: Watch the Weather Network on TV for updates on the heat alert, and any storms that spark. If it's safe to do so, upload your pictures and videos here.

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