本帖最后由 qfweiwei 于 2014-3-1 22:08 编辑 3 y/ l8 H" ~% H6 e& O: ]" v7 l P 6 b: T; @- [4 {# F& |2 BA 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. ( s$ B# d! L5 c! M2 e9 ^At these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes. 9 l2 B- X6 r# G" H8 N1 b