FVXX20 KWBC 201925 VOLCANIC ASH ADVISORY ISSUED: 2003AUG20/1930Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/146 INFORMATION SOURCE: GUAYAQUIL MWO SIGMET. GOES-12 IMAGERY. ERUPTION DETAILS: ASH OBSERVED AT 20/1815Z OBS ASH DATE/TIME: 20/1845Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/270 MOVING N 5 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS. REMARKS: THE GEOPHYSICAL INSTITUTE REPORTS ASH TO FL270 AT 20/1756 IN ADDITION AN AIRCRAFT OBSERVED ASH AT 20/1815Z ALSO TO FL270. CURRENT SATELLITE IMAGERY THROUGH 20/1845Z SHOWS EXTENSIVE CLOUDS OVER THE AREA MAKING DETECTION OF ASH DIFFICULT....WALTER NEXT ADVISORY: WILL BE ISSUED BY 2003AUG21/0130Z NNNN