Wind chills of near -40 C have once again prompted Environment and Climate Change Canada to issue an extreme cold warning for the southwest. 

Today's high of -21 could feel more like -39, potentially staying that way until Saturday. 

Frostbite can develop within minutes on exposed skin, and risk of hypothermia is prevalent with the current wind chill values. 

Extreme cold warnings are issued when very cold temperatures or wind chill creates an elevated risk to health such as frost bite and hypothermia.

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