FVXX23 KWBC 311600 VOLCANIC ASH ADVISORY ISSUED: 2001DEC31/1600Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S 7826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M) . ADVISORY NUMBER: 2001/294 . INFORMATION SOURCE: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL IMAGERY. GEOPHYSICAL INSTITUTE. 12 HOUR WIND FORECAST FROM THE 31/0600Z AVIATION MODEL. . ERUPTION DETAILS: VOLCANIC ASH OVER THE VOLCANO AT 31/1519Z. . DETAILS OF ASH CLOUD: THE GEOPHYSICAL INSTITUTE OBSERVED VOLCANIC ASH OVER THE VOLCANO FROM THE SUMMIT TO FL250. SATELLITE IMAGERY THROUGH 31/1545Z DOES NOT INDICATE ANY ASH. WE WILL CONTINUE TO MONITOR IMAGERY AND SEND ANOTHER ADVISORY IF CONDITIONS WARRANT. . TRAJECTORY: ANY ASH BETWEEN THE SUMMIT AND FL250 WILL MOVE TOWARDS THE WEST AT 10 KNOTS. . OUTLOOK: SEE SIGMETS. . NEXT ADVISORY: NO FURTHER ADVISORIES . WALTER/SCHWARTZ . NNNN