FVXX23 KWBC 311930 VOLCANIC ASH ADVISORY ISSUED: 2001DEC31/1930Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S 7826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M) . ADVISORY NUMBER: 2001/295 . INFORMATION SOURCE: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL IMAGERY. GEOPHYSICAL INSTITUTE. SIX HOUR WIND FORECAST FROM THE 31/1200Z AVIATION MODEL. . ERUPTION DETAILS: VOLCANIC ASH OVER THE VOLCANO AT 31/1650Z. . DETAILS OF ASH CLOUD: THE GEOPHYSICAL INSTITUTE OBSERVED VOLCANIC ASH OVER THE VOLCANO FROM THE SUMMIT TO FL220. SATELLITE IMAGERY THROUGH 31/1845Z SHOWS A SMALL PUFF OF ASH APPROXIMATELY 10 KM TO THE NORTHWEST OF THE SUMMIT MOVING WEST-NORTHWEST. . TRAJECTORY: ANY ASH BETWEEN THE SUMMIT AND FL220 WILL MOVE TOWARDS THE WEST-NORTHWEST AT 10 KNOTS. . OUTLOOK: SEE SIGMETS. . NEXT ADVISORY: WILL BE ISSUED BY 2001DEC31/2345Z. . WALTER . NNNN