FTUS45 KREV 170521 TAFCXP TAF KCXP 170521Z 1706/1806 06012KT P6SM SKC FM170800 06010KT P6SM SKC FM171100 VRB03KT P6SM SKC FM171900 09007KT P6SM SCT200 FM180400 VRB03KT P6SM BKN200=