FVXX20 KWBC 171048 VOLCANIC ASH ADVISORY ISSUED: 2003OCT17/1000Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/377 INFORMATION SOURCE: GOES-12 IMAGERY. GEOPHYSICAL INSTITUTE. GFS MODEL WINDS FORECAST. GUAYAQUIL MWO SIGMET ERUPTION DETAILS: CONTINUED ASH AND GAS EMISSIONS. OBS ASH DATE/TIME: 17/0915Z OBS ASH CLOUD: SFC/FL270 S0128W07826 S0212W07756 S0056W07712 S0030W07734. ASH IS MOVING NE AND SE 5 TO 10 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS Z REMARKS: MULTISPECTRAL IMAGERY INDICATES THIN ASH FANNING OUT FROM THE SUMMIT. BOUNDARIES ARE APPROXIMATE. THE AREA IS APPROXIMATELY 80 NM LONG AND 40 NM WIDE. AT 0610Z THE GEOPHYSICAL INSTITUTE REPORTED ASH AT FL270. NEXT ADVISORY: WILL BE ISSUED BY 2003OCT17/1600Z. NNNN