FVXX20 KWBC 210400 VOLCANIC ASH ADVISORY ISSUED: 2003NOV21/0400Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/515 INFORMATION SOURCE: GOES-12 IMAGERY. GEOPHYSICAL INSTITUTE. GUAYAQUIL MWO SIGMET ERUPTION DETAILS: OCCASIONAL ASH EMISSIONS OBS ASH DATE/TIME: 21/0315Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/200 MOVING W 10 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS REMARKS: IT IS DIFFICULT TO DETECT ASH OVER THE VOLCANO DUE TO EXTENSIVE CLOUDS. ANY ASH SHOULD MOVE TO THE WEST AT 10 KNOTS. NEXT ADVISORY: WILL BE ISSUED BY 2003NOV21/1000Z NNNN