FVXX20 KWBC 231655 VOLCANIC ASH ADVISORY ISSUED: 2002FEB23/1655Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S7826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M). . ADVISORY NUMBER: 2002/089 . INFORMATION SOURCE: GOES-8 IMAGERY. GEOPHYSICAL INSTITUTE. GUAYAQUIL MWO SIGMET . ERUPTION DETAILS: ASH OBSERVED AT 23/1602Z. . OBS ASH DATE/TIME: 23/1602Z . OBS ASH CLOUD: FL/UNK MOVING SW 5-15 KNOTS ASH NOT IDENTIFIABLE FROM SATELLITE DATA. . FCST ASH CLOUD+6H: SEE SIGMETS. . REMARKS: THE GEOPHYSICAL INSTITUTE REPORTED A PROBABLE ASH CLOUD OF UNKNOWN HEIGHT AT 1602Z AND MOVING WSW. EXTENSIVE CLOUDINESS PRECLUDED THE DETECTION OF ASH IN SATELLITE IMAGERY THROUGH 1615Z. . NEXT ADVISORY: WILL BE ISSUED BY 2002FEB23/2300Z. . NNNN