FTCN31 CWAO 181300 TAF CBBC 181340Z 1814/1902 13012G22KT 2SM -RA BR OVC004 TEMPO 1814/1902 6SM -RA BR SCT004 OVC012 BECMG 1815/1817 20015G25KT RMK FCST BASED ON AUTO OBS. NXT FCST BY 181900Z=