Canada is living up to its “Great White North” reputation as multiple pockets of winter weather cause heavy snow, dangerous driving conditions, bridge closures and concern for the homeless.

Residents in southern Ontario could see their first big blast of winter this season starting Sunday, when a system out of the U.S. is expected to bring up to 20 centimetres of snow to some areas.

Environment Canada issued a special weather statement Saturday for much of southern Ontario. The national weather agency said a low pressure system is likely to impact areas from Sarnia all the way to Kingston in Eastern Ontario.

“Current information suggests the precipitation will fall primarily as snow, but with a possibility of changing over to rain early Monday morning, particularly near the shores of Lake Ontario,” the statement read.

Toronto and the GTA can expect 10-15 centimetres of snow, while snow squalls are expected to affect areas around the Bruce Peninsula, creating low to zero visibility.

Wintry weather has already affected other parts of Canada, including British Columbia’s typically mild south coast. Lower temperatures have brought snow to the region this week.

Falling snow and ice has forced the closure of the Alex Fraser Bridge in Metro Vancouver. The bridge connects Richmond and New Westminster with North Delta.

As of Saturday afternoon, there were also extreme cold warnings in some parts of Alberta, including Edmonton and Fort McMurray. Wind chill could see temperatures dip to minus 40 in the northern and central regions of the province.

The City of Edmonton is keeping its underground LRT concourses open all night to protect the city’s homeless from the frigid weather. Shelters are expected to fill up quickly.

An extreme cold warning is also in place in Lloydminster, Saskatchewan.

Environment Canada has issued snow squall warnings in four counties in northern Nova Scotia. The Cape Breton area is expected to be hardest hit with forecasts calling for up to 30 centimetres by Sunday evening.

Officially, the first day of winter is Dec. 21.