FVXX21 KWBC 270730 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0720 UTC 27 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-173 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 MULTISPECTRAL AND INFRARED IMAGERY...SIGMET FROM GUAYAQUIL METEOROLOGICAL WATCH OFFICE... REPORT FROM THE GEOFISICO INSTITUTO. . ERUPTION DETAILS: CONTINUOUS ASH AND GAS EMISSIONS . DETAILS OF ASH: NO ASH IS SEEN IN SATELLITE IMAGERY THROUGH 27/0645 UTC. HOWEVER THE DENSE WEATHER CLOUDS IN THE AREA MIGHT BE OBSCURING ASH IN THE IMAGERY. THE GEOFISICO INSTITUTO REPORTS THAT THE VOLCANO HAS AN ALMOST PERMANENT PLUME OF GASES AND A LITTLE ASH THAT REACHES AROUND 1KM (3,300FT) ABOVE THE SUMMIT OR TO AROUND FL200. . TRAJECTORY: UPPER AIR PATTERNS OVER THE VOLCANO ARE QUITE VARIABLE AND ASH COULD EASILY MOVE IN A VARIETY OF DIRECTIONS. HOWEVER AT ABOUT FL200 SOME OF THE ASH WILL PROBABLY MOVE TO THE SOUTHWEST AT LESS THAN 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 27/1330 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN