Squalls with wind gusts up to 35 knots, hail of 1 to 2 centimetres and poor to very poor visibility in thunderstorms heavy at times are expected or occurring in the area.
Thunderstorms are expected to track east across Lake Simcoe over the next couple hours.
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Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.