When will the heat wave end?

Extreme heat warnings have been issued across southwestern Ontario

Extreme heat warnings have been issued across southwestern Ontario

A new heat warning system is now in place to warn Nova Scotians when hot and humid weather has the potential to be harmful. That rain may turn into a full-out thunderstorm, so plan your outdoor activities accordingly.

Urgences-sante says it has been inundated by the volume of calls since a heat wave enveloping Eastern and Central Canada settled in for an extended stay over the weekend.

The Canadian weather agency issues heat warnings "when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion". The Atlantic region's heat wave is expected to break midweek, and Southern Ontario's should only last until Friday.

Nighttime will offer some relief each day with temperatures hovering around 20 C. The humidity will stick around though.

"We would prefer having no deaths related to heat but with four days of intense heat and especially hot nights, we expect to see an impact on people's health", Kaiser said.

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And with the muggy temperatures expected to persist for at least another two days, authorities are urging people to remain vigilant.

Environment Canada said much of southern Ontario, including Toronto, also remains under a heat warning, with a humidex reading of 43 expected on Tuesday.

An area of high pressure is going to keep cool air locked in Canada for most of the week, AccuWeather reports. Friday is forecast to be 28 C with a 40 per cent chance of showers.

Drouin said there have been thousands of home visits and that officials want to avoid the results of an extended heat period in 2010, when 106 people died in the Montreal area.

People at risk of heat-related illnesses include those with chronic illnesses, people with limited mobility or certain mental health illnesses, infants and young children, people on certain medications, and the homeless.

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