请密切关注天气情况,做足保暖措施,防止冻伤。 . O( p" _/ K( S% b1 AA 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. ) V; a& [4 o* b$ b. @ # y9 t/ s: S( [- T& F" W9 u+ |At these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes.