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Another heat wave ahead in southern Ontario?


Extreme heat is returning to southern Ontario
Extreme heat is returning to southern Ontario

Staff writers

June 28, 2012 — With temperatures soaring, people in Ontario could experience their second official heatwave in as many weeks.

The humidity made Friday feel like a hot one in several communities
The humidity made Friday feel like a hot one in several communities

Saturday was yet another"spare the air day"across several cities in southern Ontario. Temperatures sizzled in southern sections of the province again, just ahead of the Canada Day long weekend.

"We could have another heat wave on our hands," says Gerald Cheng, a meteorologist at The Weather Network.

A heat wave in Ontario is defined as three or more consecutive days with temperatures above 32C.

"We have a very hot air mass from the US Midwest targeting extreme southern Ontario," Cheng explains. "The next few of days will be hot, hazy and humid as a result."

Thursday was a scorcher across the region, with temperatures in Windsor, London and Sarnia climbing into the 30's. With the humidity, it felt closer to 35 or 40.

Friday turned out to be little different, and Cheng says although temperatures should cool down slightly into the weekend, it won't be by much. People can still expect temperatures in the high 20s or low 30s, feeling even hotter with the humidity.

The air won't be quite so thick. Environment Canada and Ontario's Ministry of the Environment lifted some smog advisories in the south-central part of the province, including the city of Toronto, Halton and York regions, Peterborough and others.

Smog advisories are still in place for the southwest, including Windsor, London, Hamilton and others.

Millions to attend Toronto's Pride Parade. Be sure to keep hydrated and take cover in cool areas as much as possible.
Millions to attend Toronto's Pride Parade. Be sure to keep hydrated and take cover in cool areas as much as possible.

The warm weather prompted officials to issue a heat alert Thursday morning, which was extended well into long weekend.

Temperatures are expected to cool by a few degrees on Sunday and Monday. It will be a busy weekend in the city, with several outdoor events planned for today and Sunday, including the popular Pride Parade in Toronto.

For extreme heat alerts, the city opens several air conditioned facilities across the city to the public. In any case, people are encouraged to avoid strenuous activities and limit their time spent outdoors. Residents are also advised not to leave any seniors, children or pets unattended in a car.

Last week, both Pearson and Buttonville airports reached heat wave status for the first time this year.

With the heat and humidity also comes a risk of storms, especially in southwestern Ontario.

A tornado warning was briefly issued on Thursday night for the Chatham-Kent area as storm spotters reported a funnel cloud over the city of Chatham. The warning was dropped shortly after as the cell moved over Lake Erie, and Friday night was not forecast to receive any significant severe weather.

For more details on what to expect over the long weekend, check our Canada Day Forecast.

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