; ]3 ^' R8 k, V9 h- |, uA very cold Arctic airmass and winds of 15 to 20 km/h will generate wind chill values below minus 40 across much of Alberta tonight. Conditions will improve somewhat by Sunday afternoon as temperatures rise. : M$ M+ W+ Z, E/ v( a) S, D4 lAt these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes.: D* t5 |: f( @% K