FVXX21 KWBC 182330 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2330 UTC 18 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-137 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. UPPER-AIR DATA AND REPORTS FROM THE GEOFISICO INSTITUTO. . ERUPTION DETAILS: CONTINUOUS STEAM AND ASH EMISSIONS. . DETAILS OF ASH: CLOUDINESS OVER THE AREA MAKES ANY ASH DETECTION DIFFICULT. MULTISPECTRAL IMAGERY THRU 2245 UTC DOES NOT SHOW ANY ASH BEING EMITTED FROM THE VOLCANO. . TRAJECTORY: ANY ASH BETWEEN FL100 AND FL200 WILL MOVE TO THE WEST AT LESS THAN 10 KNOTS. ANY ASH BETWEEN FL250 AND FL350 WILL MOVE SOUTHWEST BETWEEN 15 AND 30 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 19/0530 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN