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Thunderstorm threat hangs over Ontario with the greatest chance for severe weather expected on Canada Day Tuesday. Will these storms impact your plans? Details here.

Canada Day thunderstorms to hit southern Ontario, plan accordingly

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Andrea Bagley
Digital Reporter

Monday, June 30, 2014, 4:01 PM - High heat and humidity will be the perfect ingredients for thunderstorms to fire up across parts of Ontario Monday.

Daytime highs are forecast to be around 30°C, feeling closer to 40 with the humidex.

EXTENDED ACTIVE WEATHER COVERAGE: Watch the Weather Network on TV for regular updates on this massive rain system, and send us your pictures and videos.

"Conditions are favourable for the development of severe thunderstorms that may be capable of of producing strong wind gusts and large hail," warned Environment Canada in a severe thunderstorm watch issued for northern Ontario early Monday. "Take cover immediately, if threatening weather approaches."

The thunderstorm risk will sink south on Monday afternoon, but the greatest chance for severe storms in southern Ontario will be on Canada Day Tuesday.

RELATED: Humidity may spark strong storms in Ontario

"An impeding cold front will trigger severe weather for southern Ontario and southern Quebec Tuesday," says Weather Network meteorologist Brian Dillon. "These thunderstorms have the potential to produce torrential downpours and gusty winds."

The heat and humidity are expected to persist on Canada day, however the approaching cold front will bring cooler and less humid conditions for the remainder of the week.

Will these storms ruin your Canada Day plans? Be sure to check as our meteorologists continue to keep an eye on the exact timing and severity of this system.

You can also keep on top of watches and warnings with our Alerts page.

How's Canada Day shaping up? Sunday update
Humidity may spark strong storms in Ontario
In Pictures: Massive Prairie rainfall sparks flooding
Morning Briefing: Four things to know about Sunday

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