With a snowfall warning in effect across southern and eastern Quebec, airport officials are warning passengers to check the status of their flights ahead of time, as a storm that pummeled the American southeast moves its way northward.

The snow started to fall in the Montreal area Thursday evening, and dozens of flights at Montreal's Trudeau International Airport were already delayed and cancelled.

The heaviest snowfall is expected in the Eastern Townships, the Gaspé peninsula, and Quebec City.

Environment Canada is predicting those regions will see between 40 and 50 centimetres of snow.

The system could also bring high winds of up to 100 km/h, and cause whiteouts in some exposed regions along the southern shore of the St. Lawrence River.

“Beware, these difficult winter conditions could make travel impossible,” Environment Canada said in the warning.

A second storm will likely hit some of the same regions over the course of the weekend.

So far, nearly 3,300 flights have been cancelled in the United States.

Click here for a complete list of Environment Canada’s weather warnings. Also keep an eye on CBC.ca/Montreal for the latest on weather, road conditions and weather-related closures.