FVXX21 KWBC 210800 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0800 UTC 21 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-147 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 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 21/0715 UTC SHOWS EXTENSIVE MULTILAYERED CLOUDS SHROUDING THE AREA AROUND THE VOLCANO MAKING DETECTION OF ASH IMPOSSIBLE. . TRAJECTORY: ANY ASH AT FL350 WOULD MOVE TOWARD THE WEST-SOUTHWEST AT 10-15KT. ANY ASH BETWEEN FL350 AND FL450 WOULD MOVE TOWARD THE WEST AT 20-40KT. . 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. . THE NEXT STATEMENT WILL BE ISSUED BY 21/1400 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . WALTER/SAB/NOAA/NESDIS . NNNN