Environment Canada has issued an extreme cold warning for much of southern Ontario heading into the weekend.

According to the notice for Durham and York regions, temperatures are expected to rapidly fall through the day Friday (Jan. 14), with wind chill values near -30 to develop overnight,” it reads.

“A reprieve from extreme cold conditions is expected to begin Saturday morning,” it reads.

Residents are encouraged to bundle up and dress according to conditions.

“Watch for cold related symptoms: shortness of breath, chest pain, muscle pain and weakness, numbness and colour change in fingers and toes,” the warning reads.

“Dress warmly. Dress in layers that you can remove if you get too warm. The outer layer should be wind resistant. Cover up. Frostbite can develop within minutes on exposed skin, especially with wind chill.”