Squalls with wind gusts up to 60 knots, frequent lightning, hail up to 4 centimetres and poor to very poor visibility in thunderstorms heavy at times are expected or occurring in the area.
A line of dangerous thunderstorms capable of producing winds gusting over 60 knots will affect western Lake Ontario. Large hail also possible.
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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.