Environment Canada has issued cold warnings for much of southern Ontario, saying wind chills near -40 C are expected in some areas.
The warnings cover areas between Windsor, Ont., and the Ontario border with Quebec, including the Greater Toronto Area and Ottawa.
Environment Canada says Toronto could see wind chills of -30 to -35 C overnight and early Friday morning, while Ottawa and other parts of eastern Ontario will experience wind chills of -33 to -38 C.
It says people should cover up and watch out for frostbite that can develop within minutes on exposed skin.
