FVXX21 KWBC 121830 VOLCANIC ASH ADVISORY ISSUED: 2003MAR12/1830Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/024 INFORMATION SOURCE: GOES-8 IMAGERY. GFS MODEL WINDS FORECAST. GUAYAQUIL MWO SIGMET ERUPTION DETAILS: CONTINUING EMISSION OF GASES AND LIGHT ASH. OBS ASH DATE/TIME: 11/1815Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL270 MOVING W 10-15 KNOTS. FCST ASH CLOUD +6H: SEE SIGMETS. REMARKS: ASH CAN NOT BE SEEN IN THE SATELLITE IMAGERY THOUGH 12/1815Z. ASH WAS OBSERVED BY THE GEOPHYSICAL INSTITUTE AT 12/1704Z WITH NO HEIGHT ASSIGNMENT GIVEN....WALTER NEXT ADVISORY: WILL BE ISSUED BY 2003MAR13/0030Z. NNNN