FVXX20 KWBC 310257 VOLCANIC ASH ADVISORY ISSUED: 2003AUG31/0300Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/189 INFORMATION SOURCE: GOES-12 IMAGERY. GFS MODEL WINDS FORECAST. GUAYAQUIL SIGMET. ERUPTION DETAILS: ONGOING ERUPTION SINCE 20/1745Z. OBS ASH DATE/TIME: 31/0215Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE IN SATELLITE DATA. WINDS SFC/FL200 MOVING W 5-10 KNOTS. WINDS FL200/270 MOVING NE 10- 15 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS AND VAFTAD. REMARKS: EXTENSIVE CLOUDS COVER THE AREA. THE LAST REPORT OF ASH FROM EARLIER TODAY WAS AT FL270. NEXT ADVISORY: WILL BE ISSUED BY 2003AUG31/0900Z. NNNN