Environment Canada has issued an extreme cold warning for the region.

The weather agency says a prolonged period of very cold wind chills is expected.

Wind chill values near minus 40 are expected overnight and Wednesday morning.

A passing cold front will have overnight temperatures drop to between minus 26 to minus 30 degrees. Gusty winds in combination with the cold temperatures will lead to wind chills near minus 40. Wind chill values are expected to moderate for Wednesday afternoon.

Wind chill values near minus 40 are expected to return for Wednesday night into Thursday morning.

Extreme cold puts everyone at risk.

Risks are greater for young children, older adults, people with chronic illnesses, people working or exercising outdoors, and those without proper shelter.

Cover up. Frostbite can develop within minutes on exposed skin, especially with wind chill.