An extreme cold weather alert remains in effect for Toronto, where temperatures are expected to drop to -13 C overnight Saturday.

Gusting winds will make it feel like -22 C according to Environment Canada.

The alert was originally issued on Friday by the city's medical officer of health, and was extended early Saturday "until further notice."

The city opens 24-hour shelters during extreme cold weather alerts. It also mobilizes more outreach workers and transportation services. Residents are asked to call 311 if they see someone on the street who needs help, or 911 if it is an emergency.

City staff tell CBC News 77 people used those shelters last night.

The city came under fire from homeless advocates this week after two homeless men died amid freezing temperatures, though there has been no link between the deaths and a lack of city services.

The forecast for Sunday calls for a high of -2 C.