FVXX20 KWBC 312215 VOLCANIC ASH ADVISORY ISSUED: 2002JUL31/2215Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M) . ADVISORY NUMBER: 2002/363 INFORMATION SOURCE: AVN MODEL WINDS FORECAST. GUAYAQUIL MWO SIGMET. GEOPHYSICAL INSTITUTE. GOES-8 IMAGERY. . ERUPTION DETAILS: AIRCRAFT REPORT OF ASH AT 31/2153Z . OBS ASH DATE/TIME: 31/2153Z . OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/FL200 MOVING W 15-20 KNOTS. . FCST ASH CLOUD+6H: SEE SIGMETS. . REMARKS: A NEW SIGMET OUT OF GUAYAQUIL INDICATES AN AIRCRAFT REPORT OF ASH AT 31/2153Z. REPORTED HEIGHT OF ASH IS BETWEEN FL165 AND FL200 MOVING WEST. CURRENT SATELLITE IMAGERY THROUGH 31/2145Z SHOWS CONSIDERABLE CLOUDS OVER THE AREA MAKING DETECTION OF ASH DIFFICULT.....WALTER . NEXT ADVISORY: WILL BE ISSUED BY 2002AUG01/0430Z. . NNNN