It might not be a white Christmas, but it could very likely be a white Boxing Day in and around Toronto.
Environment Canada has issued a special weather statement saying a low-pressure system will develop over Texas on Christmas Day and then move northeastward, affecting Ontario.
The storm track would place southern Ontario on the cold side of the storm, creating the right conditions for significant snowfall.
"Big-time snowfall accumulations are certainly a possibility," said CBC meteorologist Jay Scotland.
Scotland said the weather system will start in southwestern Ontario early Boxing Day then work its way across the province from southwest to northeast.
"If you do not have the snow tires on the vehicle, do not plan on doing any driving, certainly through the second half of Boxing Day."
Environment Canada is calling for 10 to 15 centimetres of snow in the southwest and St. Lawrence Valley areas, while Toronto and the rest of central Ontario could see up to 10 centimetres.
More than 200 flights at Toronto's Pearson International Airport were cancelled Tuesday with the storm threatening the U.S. East coast.
Christmas Day flights to and from cities including Boston, Pittsburgh and New York make up the bulk of those cancelled.
Some eastern and northern Ontario flights have also been cancelled, as well as some Maritime routes.
Travellers are advised to check their flight status beforeheading to the airport.