"Given the high heat and humidity, a few of these thunderstorms could be intense, resulting in localized torrential downpours", the statement says. All severe thunderstorm warnings have since ended.
Thursday's thunderstorms are expected to be slow moving, which means some locations could receive up to 25 to 50 mm of rain over a short period of time.
The rain will see the overnight low dip to around 18 C. Localized wind gusts of up to 90 km/h are also possible.
Take cover immediately, if threatening weather approaches.
The temperature is now 31°C in Toronto, with a humidex reaching 43°C this afternoon.
Environment Canada said a cool down is expected on Friday with the passing of a cold front.
Today is the seventh consecutive day in which the temperature has reached 30 C or above in Toronto.
Environment Canada issued the watch just after noon on Thursday, saying the hot and humid conditions are favourable for the development of risky thunderstorms which could result in localized torrential downpours. "The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors".
Please continue to monitor alerts and forecasts issued by Environment Canada.
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