请密切关注天气情况,做足保暖措施,防止冻伤。# h( J0 n7 O, @& d0 f
A 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. 2 [! p, E) H( `* T# k9 X 3 S* A' w: w4 S& w- Y' ~$ H9 _At these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes.