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Hot and muggy conditions will dominate much of southern Ontario Monday, the perfect ingredient for isolated severe storms.

High heat and humidity to help spark thunderstorms in southern Ontario

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Andrea Bagley
Digital Reporter

Monday, June 23, 2014, 12:46 PM -

Enjoy the pleasant conditions while you can.

After the fifth weekend without rain in southern Ontario, a thunderstorm risk creeps into the region Monday afternoon. 

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"There's a thunderstorm risk for southwestern Ontario this afternoon through the Windsor-Chatham area," says Weather Network meteorologist Kelly Sonnenburg. "Thunderstorms will push north and east with the system reaching the Greater Toronto Area by the evening/pre-dawn hours."

By Tuesday, a widespread thunderstorm risk will cover much of southern Ontario.

"Temperatures will be hot and muggy both Monday and Tuesday sparking convection," Sonnenburg adds.

There's also a chance for non-severe storms in northwestern Ontario Monday afternoon.

Humidex values will range from 32 in Cottage Country, to 38 in extreme southwestern Ontario.

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Temperatures will remain near seasonal through the week and humidex readings after Tuesday will be near 30.

Weather history:

On this day in 2010, an F2 tornado tore through Midland, Ontario causing $15 million in damage.

On the same day, a magnitude 5.0 earthquake prompted a state of emergency in Gracefield, Quebec. The epicentre was located about 60 km north of Ottawa and people reported feeling the quake across Ontario and Quebec.

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