FVXX20 KWBC 181358 VOLCANIC ASH ADVISORY ISSUED: 2003DEC18/1400Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/621 INFORMATION SOURCE: GOES-12 IMAGERY. GFS MODEL WINDS FORECAST. GUAYAQUIL MWO SIGMET. ERUPTION DETAILS: ASH EMISSIONS OBS ASH DATE/TIME: 18/1345Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/260 MOVING TO W 15-25 KNOTS. FCST ASH CLOUD+6H: NOT AVBL FCST ASH CLOUD+12H: NOT AVBL FCST ASH CLOUD+18H: NOT AVBL REMARKS: THE GEOPHYSICAL INSTITUTE LAST OBSERVED ASH TO FL260 AT 17/2113Z. SATELLITE IMAGERY HAS NOT SHOWN ASH ALTHOUGH THERE HAVE BEEN EXTENSIVE CLOUDS IN THE VICINITY OF THE VOLCANO. NEXT ADVISORY: NO FURTHER ADVISORIES. NNNN