FVXX21 KWBC 211352 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1400 UTC 21 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-148 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 21/1315 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 NORTHWEST AT 10 KT. WINDS BETWEEN FL240 AND FL300 ARE LIGHT AND VARIABLE IMPLYING THAT ANY ASH IN THIS LAYER WOULD MOVE LITTLE. . 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 21/2000 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . TURK/SAB/NOAA/NESDIS . NNNN