FVXX20 KWBC 181315 VOLCANIC ASH ADVISORY ISSUED: 2002AUG18/1515 VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M) . ADVISORY NUMBER: 2002/400 . INFORMATION SOURCE: GOES-8 IMAGERY. GUAYAQUIL SIGMET. AVN MODEL ERUPTION DETAILS: EXHALATION AT 18/1200Z . OBS ASH DATE/TIME: 18/1245Z . OBS ASH CLOUD: FL165/200 5-10 NM WIDE FAINT LINE OF ASH EXTENDING BETWEEN S0128W07857 S01276W07843 MOVING WEST 5-10 KT. . FCST ASH CLOUD+6H: SEE SIGMETS. . REMARKS: SURFACE REPORT INDICATES ASH OVER SUMMIT MOVING WEST. FIRST VISIBLE IMAGERY OF DAY SHOWS FAINT LINE OF ASH MOVING WEST. HEIGHT ESTIMATED AT FL200. NEXT ADVISORY: NEXT ADVISORY BY 2002AUG18/1900Z . NNNN