FVXX20 KWBC 182338 VOLCANIC ASH ADVISORY ISSUED: 2003SEP18/2345Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/257 INFORMATION SOURCE: GOES-12 IMAGERY. GFS MODEL WINDS FORECAST. GEOPHYSICAL INSTITUTE. GUAYAQUIL SIGMET. ERUPTION DETAILS: EMISSION AT 18/2315Z OBS ASH DATE/TIME: 18/2315z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/250 MOVING W 10-15 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS. REMARKS: AN AIRCRAFT OBSERVED VOLCANIC ASH OVER TUNGURAHUA AT 2315Z TO FL250. THE ASH WAS MOVING W 10 TO 15 KNOTS. ASH IS NOT IDENTIFIABLE FROM SATELLITE DATA DUE TO EXTENSIVE CLOUDS IN THE AREA. NEXT ADVISORY: WILL BE ISSUED BY 2003SEP19/0600Z NNNN