Severe thunderstorm alert dropped after warning of potential for flash flooding

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A severe thunderstorm watch warning of the potential for “torrential rain” and flash flooding almost exactly a year after devastating floods hit the GTA has been dropped.

Environment Canada issued the initial alert just before 12:30 p.m. Sunday, adding “conditions are favourable for the development of dangerous thunderstorms that may be capable of producing strong wind gusts, large hail and torrential rain.” That alert had been dropped by mid-afternoon.

Environment Canada said up to 50 mm of rain were possible in “heavy downbursts” as well as nickel-size hail.

“Emergency Management Ontario recommends that you take cover immediately if threatening weather approaches,” the alert said. “Heavy rain can cause flash flooding and significant reductions to visibility. Strong wind gusts can damage trees, buildings and overturn vehicles.”

The alert came after police warned Sunday morning of water pooling on the Don Valley Parkway, leading to lane restrictions approaching the Gardiner Expressway.

It also came almost exactly a year after severe storms hit the GTA on July 16, 2024, causing flash flooding on the DVP, at Union Station and multiple other locations including Drake’s Bridle Path mansion.

The city is also under a heat warning, which is expected to last through Thursday, Environment Canada said.

Sunday’s high is expected to hit 31 C with a humidex of 39 C. The temperature is forecast to climb to 32 C on Tuesday, the agency said.

The Environment Canada alert warned the public to drink water often and limit exposure to the sun, while watching for the early signs of heat exhaustion that may include a headache, nausea, dizziness, thirst, dark urine and intense fatigue.

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