Environment Canada has issued winter storm warnings for southern Quebec and the Maritimes, with up to 60 centimetres of snow expected to fall in some communities.
Freezing rain warnings were also in effect, as temperatures fluctuate.
New Brunswick, southern Quebec, Newfoundland and Labrador can expect a mix of rain and snow as a low pressure system from the United States moves across the area Sunday night.
The weather system is expected to deposit between 15 and 20 cm of snow over the St. Lawrence Valley from Montreal to Quebec City through Monday evening.
Further east, the Eastern Townships to the Gaspé Peninsula will see close to 35 cm.
Eastern Newfoundland and parts of Labrador will see a lighter mix of snow and rain, while New Brunswick looks to be hit with heavier precipitation. Parts of New Brunswick could see as much as 60 cm of snow -- making for "dangerous winter weather conditions" in the Acadian Peninsula and surrounding area – while freezing rain and snow is expected in the south.
The same storm system spread rain and snow across southern Ontario through Saturday and overnight. Driving in Ontario remains hazardous as cold temperatures expected through Sunday leave most of the province's road covered in ice.
Rainfall warnings in Ontario have since been called off.
The bad weather has been working its way eastward since Thursday night, when Ontario Provincial Police in western Ontario responded to 90 collisions linked to freezing rain.
Police say most were caused by motorists driving too quickly for the icy conditions and following other vehicles too closely.
With files from The Canadian Press
