FVXX20 KWBC 210946 VOLCANIC ASH ADVISORY ISSUED: 2003NOV21/1000Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/516 INFORMATION SOURCE: GOES-12 IMAGERY. GEOPHYSICAL INSTITUTE GUAYAQUIL MWO SIGMET ERUPTION DETAILS: OCCASIONAL ASH EMISSIONS OBS ASH DATE/TIME: 21/0915Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/200 MOVING W 10 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS REMARKS: EXTENSIVE CLOUD COVER OVER THE REGION MAKES IT DIFFICULT TO DETECT ASH. AN OCCASIONALLY HOTSPOT HAS BEEN OBSERVED OVER THE PAST SIX HOURS....WALTER NEXT ADVISORY: WILL BE ISSUED BY 2003NOV21/1600Z NNNN