FVXX20 KWBC 121400 VOLCANIC ASH ADVISORY ISSUED: 2003SEP12/1355Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/235 INFORMATION SOURCE: GOES-12 IMAGERY. GUAYAQUIL MWO SIGMET. GFS MODEL WINDS FORECAST. ERUPTION DETAILS: EMISSION AT 11/0055Z OBS ASH DATE/TIME: NIL OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/250 MOVING W TO SW 10-15 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS. REMARKS: THE LATEST OBSERVATION OF ASH BY THE GEOPHYSICAL INSTITUTE WAS AT 12/1253Z OVER THE SUMMIT BUT WITH NO ESTIMATED HEIGHT. IN IMAGERY AT 12/1315Z THERE IS NO ASH DETECTED HOWEVER A WHITE MOUNTAIN WAVE CLOUD CAN BE SEEN EXTENDING SOUTHWEST FROM THE SUMMIT JUST ABOVE A BLANKET OF REGIONAL CLOUD COVER. IF ASH IS DETECTED IN IMAGERY AN UPDATE WILL BE ISSUED PRIOR TO THE NEXT ADVISORY TIME. NEXT ADVISORY: WILL BE ISSUED BY 2003SEP12/2000Z. NNNN