000 FTUS42 KCHS 170539 TAFCHS TAF KCHS 170539Z 1706/1806 21005KT P6SM SCT250 FM171400 22008KT P6SM BKN250 FM171900 20011G17KT P6SM SCT150 BKN250 FM180000 21008KT P6SM SCT150 BKN250=