- v9 i4 C+ Q% X% k/ G; S3 E3 @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. 3 N7 `. F# q; n9 L2 [* AAt these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes.' N* U$ I" g4 V, P" q3 m0 ]