请密切关注天气情况,做足保暖措施,防止冻伤。 - O8 P- [# M2 n" h5 z$ l" rA 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. 1 N% \3 L# @' w- ]" f 8 x8 R7 I4 Z$ {7 [* LAt these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes.