Squalls with wind gusts up to 35 knots and hail up to 3 centimetres are expected or occurring in the area.
A thunderstorm is located 8 nautical miles south of Toronto moving northeast at 20 knots.
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Large hail can damage vessels and cause injury.
Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.