本帖最后由 qfweiwei 于 2014-3-1 22:08 编辑 7 T/ S$ p' ^' R) Y1 q- r' Z% O s ! [; [; i, o9 D) u) a( U2 pA 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. + P8 N8 A4 W" ? yAt these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes.7 h" }( i1 }8 M