METAR: CYYC 272000Z 20004KT 150V220 40SM OVC230 13/M05 A3002 RMK CI8 SLP192 DENSITY ALT 4100FT

TAF: CYYC 271740Z 2718/2818 20007KT P6SM FEW150 BKN250 BECMG 2720/2722 16010KT FM280000 16010KT P6SM SCT150 BKN250 BECMG 2800/2802 18005KT FM280600 27005KT P6SM SKC BECMG 2816/2818 26010KT RMK NXT FCST BY 272100Z