FVXX21 KWBC 041000 . VOLCANIC ASH ADVISORY ISSUED 0950 UTC 04 NOVEMBER 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-072 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...BULLETIN AND WIND DATA FROM THE INSTITUTO GEOFISICO IN ECUADOR...AVIATION MODEL WIND FORECAST DATA FROM THE U.S. NATIONAL WEATHER SERVICE. . ERUPTION DETAILS: ASH EMISSIONS AND INTERMITTENT EXPLOSIONS. . DETAILS OF ASH: NO ASH IS VISIBLE IN SATELLITE IMAGERY THROUGH 04/0915 UTC. THE MOST RECENT ASH VISIBLE IN IMAGERY HAD BECOME TOO DIFFUSE TO OBSERVE BY ABOUT 04/0245 UTC. A SIGMET FROM GUAYAQUIL CITES SURFACE REPORTS FROM YESTERDAY INDICATING ASH OVER THE VOLCANO AND MOVING EAST SOUTHEAST BETWEEN FL240 AND FL280. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH AT ABOUT FL300 WILL MOVE TO THE SOUTHEAST AT 15 KNOTS. BETWEEN FL200 AND FL280 WINDS ARE LIGHT AND VARIABLE AND ASH WILL MOVE AT LESS THAN 10 KNOTS GENERALLY TOWARD THE SOUTH. . 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 04/1600 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN