FVXX20 KWBC 071423 VOLCANIC ASH ADVISORY ISSUED: 2003DEC07/1430Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/578 INFORMATION SOURCE: GOES-12 IMAGERY. GFS MODEL WINDS. GEOPHYSICAL INSTITUTE ERUPTION DETAILS: OCCASIONAL ASH EMISSIONS OBS ASH DATE/TIME: 07/1415Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE IN SATELLITE DATA. WINDS SFC/FL200 MOVING TO SW 10 KNOTS. FCST ASH CLOUD+6H: NOT AVBL FCST ASH CLOUD+12H: NOT AVBL FCST ASH CLOUD+18H: NOT AVBL REMARKS: A CURRENT GUAYAQUIL MWO SIGMET REPORTS THAT AN AIRCRAFT OBSERVED ASH AT 07/1415Z TO FL200. ASH CAN NOT BE SEEN IN THE CURRENT SATELLITE IMAGERY DUE TO EXTENSIVE CLOUDS OVER THE REGION....WALTER NEXT ADVISORY: WILL BE ISSUED BY 2003DEC07/2030Z NNNN