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Dozens of flights at Montreal’s Trudeau airport were grounded Monday ahead of a winter storm expected to start affecting the region by Tuesday morning. Most of the flights affected were to and from the eastern United States. If you plan to fly, check with your airline or Trudeau airport first.

Visibility will be suddenly reduced to near zero at times in heavy snow and blowing snow, Environment Canada says in its winter storm warning, issued for Montreal, Châteauguay, Laval, and Longueuil, with up to 45 centimetres expected for the Eastern Townships, Beauce, Charlevoix and parts of the Gaspé Peninsula.

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The snowstorm is being blamed on a low-pressure system in the central U.S. that will blow over New England, intensifying on its way to Canada.

Southern and central Quebec will probably see between 15 and 30 cm of snow by Wednesday, coupled with winds gusting from 70 to 100 kilometres per hour, the weather service forecast.

Environment Canada recommends postponing non-essential travel until conditions improve.