FVXX21 KWBC 212000 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2000 UTC 21 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-149 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE...INFRARED AND MULTISPECTRAL IMAGERY... THE GEOFISICO INSTITUTO...21/0000 UTC AVIATION MODEL UPPER AIR WIND DATA. . ERUPTION DETAILS: CONTINUOUS STEAM AND ASH EMISSIONS AS REPORTED BY THE GEOFISICO INSTITUTO. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 21/1915 UTC SHOWED EXTENSIVE MULTILAYERED CLOUDS SHROUDING THE AREA AROUND THE VOLCANO MAKING DETECTION OF ASH IMPOSSIBLE. HOWEVER OVER THE LAST THREE HOURS METAR REPORTS FROM SELT HAVE INDICATED VOLCANIC ASH OVER TUNGURAHUA MOVING TO THE NORTHEAST. THE HEIGHT OF THE ASH IS ESTIMATED TO BE BETWEEN FL240 AND FL300. . TRAJECTORY: TOWARD THE NORTHEAST AT APPROXIMATELY 10 KNOTS. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH ADVISORY STATEMENTS OFTEN ACCOMPANIED BY A MAP DEPICTING ASH LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS http://www.ssd.noaa.gov/VAAC/washington.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 22/0200 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . TURK/SAB/NOAA/NESDIS . NNNN