FVXX20 KWBC 171809 VOLCANIC ASH ADVISORY ISSUED: 2004JUL17/1809Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W7826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2004/381 INFORMATION SOURCE: GUAYAQUIL MWO. GOES-12 IMAGERY. GFS MODEL WINDS FORECAST. GEOPHYSICAL INSTITUTE. ERUPTION DETAILS: OCCASIONAL ASH EMISSIONS OBS ASH DATE/TIME: 17/1745Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/230 MOVING TO W 15-20 KNOTS. FCST ASH CLOUD +6H: NOT AVBL FCST ASH CLOUD +12H: NOT AVBL FCST ASH CLOUD +18H: NOT AVBL REMARKS: THE LATEST OBSERVATION OF ASH BY THE INSTITUTE WAS AT 1300Z TO FL210 MOVING WEST. IT IS DIFFICULT TO DETECT ASH FROM SATELLITE IMAGERY DUE TO EXTENSIVE CLOUDS OVER THE VOLCANO. ...KARST NEXT ADVISORY: WILL BE ISSUED BY 2004JUL18/0015Z NNNN