FVXX21 KWBC 281630 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1630 UTC 28 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-179 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE AND MULTISPECTRAL AND INFRARED IMAGERY...REPORT FROM THE GEOFISICO INSTITUTO...WIND DATA FROM THE GEOFISICO INSTITUTO...VAFTAD...0000 UTC AVIATION MODEL WIND FORECAST . ERUPTION DETAILS: CONTINUOUS ASH AND GAS EMISSIONS . DETAILS OF ASH: LATEST SATELLITE IMAGERY THRU 1545 UTC DOES NOT INDICATE ANY VOLCANIC ASH BEING EMITTED FROM THE VOLCANO. HOWEVER LOW AND MIDDLE LEVEL CLOUDS IN THE VICINITY OF THE VOLCANO MIGHT PREVENT ANY DETECTION OF THIS ASH. EARLIER REPORTS FROM THE INSTITUTE IN QUITO PLACED ASH EMISSIONS UP TO FL300. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN FL160 AND FL300 WILL MOVE TO THE SOUTHWEST AT ABOUT 15 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 28/2230 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN