本帖最后由 qfweiwei 于 2014-3-1 22:08 编辑 % v7 W; l2 k- T$ s3 g& _ $ J! R+ _' E) dA 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. ) N/ m7 k6 g7 N8 d4 BAt these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes.1 d6 D9 r' p, r5 w