0 }5 I# D8 z- Z! T: KA 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. ' P' j2 {+ w3 [! [. WAt these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes.- O4 y# @! g5 o! ]6 Q