本帖最后由 qfweiwei 于 2014-3-1 22:08 编辑 % c6 ? H& k- O3 g$ [( {2 q C # k) I& \ P1 M0 i/ k9 U/ h5 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. , F* i* b' ]) n+ |% ]: m2 cAt these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes.* F9 k/ a% `: f+ G* G6 C6 v% v