Environment Canada has issued a wind chill warning for the Swift Current - Herbert - Cabri - Kyle - Lucky Lake forecast region after values plunged below the -40 Celsius mark.
The warning advises that wind chill values of minus 40 or colder will occur tonight and into Thursday morning.
"A cold Arctic airmass combined with wind speeds of 15 to 25 kilometers per hour are producing wind chills of minus 40 to minus 45 this evening over much of Southern Saskatchewan. These wind chills will persist tonight and into Thursday morning as overnight lows fall into the minus 30s," the warning notes.
At these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes.