Squalls with wind gusts up to 45 knots and frequent lightning are expected or occurring in the area.
A thunderstorm south of Toronto is moving southeast at 35 knots.
Stronger wind gusts near 55 knots are possible this afternoon as a cold front moves through from the northwest.
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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.