FVXX20 KWBC 231950 VOLCANIC ASH ADVISORY ISSUED: 2003SEP23/2000Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/277 INFORMATION SOURCE: GOES-12 IMAGERY. GFS MODEL WINDS FORECAST. GUAYAQUIL MWO SIGMET ERUPTION DETAILS: EMISSION AT 21/2345Z OBS ASH DATE/TIME: 23/1915Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/200 MOVING W 5-10 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS. REMARKS: ASH CAN NOT BE SEEN IN THE CURRENT SATELLITE IMAGERY THROUGH 23/1916Z. THE LAST OBSERVATION OF ASH BY THE GEOPHYSICAL INSTITUTE WAS AT 23/1745Z....WALTER NEXT ADVISORY: WILL BE ISSUED BY 2003SEP24/0200Z. NNNN