Squalls with wind gusts up to 50 knots, frequent lightning, hail up to 2 centimetres and poor to very poor visibility in thunderstorms heavy at times are expected or occurring in the area.
A large area of thunderstorms over Lake Huron is moving east at 35 knots and is expected to track over Georgian Bay this afternoon.
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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.