FVXX20 KWBC 291850 VOLCANIC ASH ADVISORY ISSUED: 2004APR29/1900Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2004/181 INFORMATION SOURCE: GOES-12 IMAGERY. GFS MODEL WINDS FORECAST. ERUPTION DETAILS: AIRCRAFT OBSERVATION AT 29/1700Z OBS ASH DATE/TIME: 29/1815Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/250 MOVING TO SW 5-10 KNOTS. FCST ASH CLOUD +6H: NOT AVBL FCST ASH CLOUD +12H: NOT AVBL FCST ASH CLOUD +18H: NOT AVBL REMARKS: AN AIRCRAFT REPORT AT 29/1700Z INDICATES THAT TUNGURAHUA ERUPTED TO FL250 WITH ASH MOVING TOWARDS THE SOUTHWEST. CURRENT SATELLITE IMAGERY THROUGH 29/1815Z SHOWS CONSIDERABLE CLOUDS OVER THE AREA MAKING DETECTION OF ASH DIFFICULT....WALTER/KARST NEXT ADVISORY: WILL BE ISSUED BY 2004APR30/0100Z NNNN