Environment Canada issued a winter weather travel advisory for a large section the region.

Environment Canada is warning that travel may be hazardous Wednesday morning due to rapidly accumulating snow, slippery conditions and reduced visibility in Toronto.

Up to 20 cm of snow is expected by Sunday evening in London, Ont.

A special weather statement is in place for London, Middlesex and the rest of southwestern Ontario, saying an incoming low-pressure system will bring more snow beginning late Friday.

The weather agency said a light drizzle beginning Friday morning is expected to gain strength heading into Saturday and taper off going into Sunday.

The advisory is in effect for Peterborough, Peterborough County, City of Kawartha Lakes and Northumberland County.

The weather agency said temperatures in northern Saskatchewan were not expected to cool off until mid-week.

Environment Canada has issued a weather advisory for the Shaunavon, Maple Creek, Val Marie, and Cypress Hills regions.

Residents are urged to monitor conditions and alerts issued by Environment Canada.

The advisory was lifted late Tuesday evening.