FVXX20 KWBC 181255 VOLCANIC ASH ADVISORY ISSUED: 2002MAR18/1255Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S07826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M). . ADVISORY NUMBER: 2002/157 . INFORMATION SOURCE: GOES-8 IMAGERY. GUAYAQUIL MWO SIGMET. . ERUPTION DETAILS: GEOPHYSICAL INSTITUTE REPORT OF PROBABLE ASH EMISSION AT 1207Z. . OBS ASH DATE/TIME: 18/1207Z. . OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS UNAVAILABLE. . FCST ASH CLOUD+6H: SEE SIGMETS. . REMARKS: ASH CANNOT BE SEEN IN IMAGERY THROUGH 18/1215Z DUE TO MID LEVEL CLOUDS OVER THE REGION. ESTIMATED HEIGHT NOT AVAILABLE DUE TO CLOUD COVER FROM GROUND AND SATELLITE. BECAUSE ERUPTION HAD NOT GONE ABOVE CLOUD DECK ESTIMATE ASH BELOW FL300. . NEXT ADVISORY: WILL BE ISSUED BY 2002MAR18/1900Z. . NNNN