FVXX21 KWBC 100730 . VOLCANIC ASH ADVISORY ISSUED 0730 UTC 10 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-099 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...GUAYAQUIL METEOROLOGICAL WATCH OFFICE SIGMETS...00 UTC AVIATION NUMERICAL WEATHER MODEL WIND DATA...REPORT OF THE INSTITUTO GEOFISICO . ERUPTION DETAILS: ASH EMISSIONS AND OCCASIONAL EXPLOSIONS . DETAILS OF ASH: ASH CANNOT BE SEEN IN SATELLITE IMAGERY THROUGH 10/0645 UTC. IT IS POSSIBLE THAT THE ASH PREVIOUSLY OBSERVED IS NOW OBSCURED BY THE MID-LEVEL METEOROLOGICAL CLOUDS IN THE AREA. SEVERAL HOURS AGO ASH WAS OBSERVED TO EXTEND FROM THE SUMMIT TOWARD THE SOUTHEAST. A PILOT REPORT FROM 09/2125 UTC REPORTED ASH AT FL270 MOVING EAST SOUTHEAST. . TRAJECTORY: UPPER AIR PATTERNS INDICATE THAT ANY ASH BETWEEN FL320 AND FL250 WILL MOVE TO THE EAST AT 10 TO 15 KNOTS. ASH BETWEEN FL250 AND FL200 WILL MOVE TO THE SOUTHEAST AT LESS THAN 15 KNOTS. ASH BETWEEN FL190 AND FL150 WILL MOVE TO THE SOUTHWEST AT LESS THAN 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 10/1330 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN