本帖最后由 qfweiwei 于 2014-3-1 22:08 编辑 % p$ I8 x; J4 f$ p/ |5 L 7 ~% {/ v' r/ HA 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. . }8 I, _( s! F$ A: p, tAt these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes.% W& c: D% |: B1 e4 X, _6 v1 ^9 M( L