Squalls with wind gusts up to 35 knots, frequent lightning and hail of 1 to 2 centimetres are expected or occurring in the area.
A line of thunderstorms is moving east at 35 knots and is going to affect western Superior early this morning.
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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.