FVXX20 KWBC 201039 VOLCANIC ASH ADVISORY ISSUED: 2003SEP20/1100Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/263 INFORMATION SOURCE: GOES-12 IMAGERY. GFS MODEL WINDS FORECAST. ERUPTION DETAILS: EMISSION AT 19/1004Z OBS ASH DATE/TIME: 20/1015Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/200 MOVING NW 10-15 KNOTS. FL200/260 MOVING NE 5-10 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS. REMARKS: ASH IS NOT VISIBLE IN SATELLITE IMAGERY THROUGH 20/1015Z. WEATHER CLOUDS IN THE VICINITY OF THE VOLCANO ARE MAKING ASH DETECTION DIFFICULT. NEXT ADVISORY: WILL BE ISSUED BY 2003SEP20/1700Z. NNNN