Much of southern Ontario and Quebec is under winter storm and snowfall warnings as a low-pressure system moves east toward the Atlantic provinces.
Between 15 and 40 centimetres is forecast to fall by this afternoon across an area stretching from Windsor, Ont., to Gaspe in Quebec.
New Brunswick could see up to 25 centimetres in some areas as snowfall continues into tonight.
Snowfall in western Newfoundland is expected to continue into Friday, with at least 10 to 20 centimetres forecast.
Meanwhile, several provinces out west are dealing with an extended period of extreme cold.
Parts of southern Saskatchewan and Manitoba, along with sections of Alberta and northern Ontario, are expected to see wind-chill values of -40 or lower this week.