About 2 centimetres of snow is expected to fall in the city, though Environment Canada says Oshawa, Whitby and Belleville could see as much as 10 to 30 centimetres. Snowfall warnings are in effect for much of southeastern Ontario.
Environment Canada is advising drivers to watch out for poor conditions on the roads.
"We're only expecting a few centimetres of snow into the downtown, south of the 401, because the lake is still quite warm — so a lot of this will mix out or melt out on contact," said CBC meteorologist Jay Scotland.
The snow will hit the Toronto area mainly overnight and Wednesday morning. During the day on Tuesday there will be a chance of wet flurries, with a high of 2 C.
The storm is making its way through the eastern U.S. and could cast a shadow on travel plans for those heading south for American Thanksgiving. Anyone flying on Wednesday should double-check with their airline.