FVXX20 KWBC 230600 VOLCANIC ASH ADVISORY ISSUED: 2003DEC23/0555Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/637 INFORMATION SOURCE: GOES-12 IMAGERY. GUAYAQUIL MWO SIGMET. GEOPHYSICAL INSTITUTE. GFS MODEL WINDS FORECAST. ERUPTION DETAILS: ASH EMISSIONS. OBS ASH DATE/TIME: 23/0515Z. OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/240 MOVING TO WEST 10-15 KNOTS. FCST ASH CLOUD+6H: NOT AVBL FCST ASH CLOUD+12H: NOT AVBL FCST ASH CLOUD+18H: NOT AVBL REMARKS: DUE TO WEATHER CLOUDS NO ASH CAN BE DETECTED IN SATELLITE IMAGERY. THE GEOPHYSICAL INSTITUTE EVENING REPORT STATES THAT STEAM AND ASH EMISSIONS ARE NEARLY CONSTANT AND THAT THE PLUME RISES AROUND ONE HALF A NAUTICAL MILE ABOVE THE SUMMIT AND THEN DOWNWIND TO THE NORTHWEST. THE LAST OBSERVATION NEAR 23/0400Z ESTIMATED THE ASH OVER THE VOLCANO TO FL220. NEXT ADVISORY: WILL BE ISSUED BY 2003DEC23/1200Z. NNNN