FVXX20 KWBC 250430 VOLCANIC ASH ADVISORY ISSUED: 2002MAR25/0430Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S07826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M). . ADVISORY NUMBER: 2002/178 . INFORMATION SOURCE: GOES-8 IMAGERY. AVN MODEL WINDS FORECAST. SURFACE OBSERVATION. . ERUPTION DETAILS: NEARLY CONTINUOUS EMISSION OF GASES AND LIGHT ASH SINCE 20/2200Z. . OBS ASH DATE/TIME: 24/2200Z. . OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/FL270 MOVING W AROUND 10 KNOTS. . FCST ASH CLOUD+6H: SEE SIGMETS. . REMARKS: A 24/2200Z SURFACE OBSERVATION FROM SELT INDICATED A ASH CLOUD OVER THE VOLCANO WITH NO HEIGHT. A PREVIOUS GEOPHYSICAL INSTITUTE REPORT HAD ASH TO FL270 OVER THE VOLCANO. EXTENSIVE CLOUD COVER MAKES DETECTION OF ASH DIFFICULT IN SATELLITE IMAGERY THROUGH 25/0345Z. . NEXT ADVISORY: WILL BE ISSUED BY 2002MAR25/1030Z. . NNNN