Environment Canada has issued a Special Weather Statement for the South Coast with snowfall totals expected to hit 10 centimetres in some areas.
For the Southtowns and the Southern Tier, a lake-effect snow warning remains in effect from 5 p.m. Sunday until 6 p.m. Wednesday, covering southern Erie County and Allegany, Chautauqua, Cattaraugus and Wyoming counties.
"For those dreaming of a white Christmas, you will get your wish", Environment Canada's snowfall warning for Toronto reads.
Visibility may be limited and travel may become hard. "Today is going to be a reprieve between the storm of yesterday and the storm tomorrow". Heavier snow is expected in some areas, including the GTA.
As a result, motorists should anticipate hazardous road conditions, and prepare for longer travel times over the holidays. "Visibility will be suddenly reduced to near-zero at times".
It will start in the afternoon, with the bulk of the snow falling Sunday night.
A low-pressure system will develop off Cape Hatteras this evening and intensify rapidly as it moves northeastward to lie over southern New Brunswick by Monday evening.
Christmas afternoon will feature some lake snow near and north of the Thruway.
Although temperatures on parts of the Prairies are expected to moderate somewhat during the day on Sunday, bouts of extreme cold will continue through next week, Environment Canada says.