Extreme heat to stick around GTA for most of the week

Extreme heat to stick around GTA for most of the week

Overnight low temperatures are expected to be in the low 20s, except high teens in some rural areas, providing little or no relief from the heat.

A cooldown isn't expected until Friday, when a cold front finally passes through. However, daytime highs in the low 30s will continue Tuesday through Thursday.

A new heat warning system is now in place to warn Nova Scotians when hot and humid weather has the potential to be harmful.

Montreal city hall unveiled an "extreme heat" plan on Tuesday that includes distributing water to groups working with the homeless.

Humidex values are expected to make those temperatures feel like the low 40s.

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Environment Canada warns that extreme heat affects everyone.

Temperatures will hit 33 degrees C on Wednesday, before falling to 31 on Thursday and then 27 on Friday, the agency said.

"A cold front is going to come Thursday night, and that will drop our temperatures back to more normal ones, especially for this weekend", says Cheng.

He says most vulnerable to become sick due to high heat and humidity are infants, young children, the elderly and people with chronic health conditions like lung or heart problems.

The heat warning extends throughout the GTA and most of southern Ontario, including Hamilton, Waterloo and Barrie. Watch for the effects of heat illness: swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions. The Atlantic region's heat wave is expected to break midweek, and Southern Ontario's should only last until Friday. "And also keep in mind to make sure you don't leave any people or pets in your auto, as temperatures will rise dramatically within minutes".

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