FVXX20 KWBC 171245 VOLCANIC ASH ADVISORY ISSUED: 2003SEP17/1300Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/255 INFORMATION SOURCE: GOES-12 IMAGERY. GFS MODEL WINDS FORECAST. GUAYAQUIL MWO SIGMET. ERUPTION DETAILS: CONTINUING EMISSIONS OBS ASH DATE/TIME: 17/1215Z. OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/240 MOVING W 10-15 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS. REMARKS: ASH CAN NOT BE DETECTED IN SATELLITE IMAGERY DUE TO WIDESPREAD CLOUDINESS OVER THE VOLCANO. THE LAST OBSERVATION OF ASH BY AIRCRAFT WAS ON SEPT 16. NEXT ADVISORY: WILL BE ISSUED BY 2003SEP17/1900Z. NNNN