FVXX21 KWBC 110610 . VOLCANIC ASH ADVISORY ISSUED 0610 UTC 11 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-103 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 MULTISPECTRAL IMAGERY...GUAYAQUIL METEOROLOGICAL WATCH OFFICE SIGMETS...12 UTC AVIATION MODEL UPPER AIR DATA. . ERUPTION DETAILS: CONTINUOUS VENTING OF ASH AND STEAM NOW AT LOWER LEVELS. . DETAILS OF ASH: DENSE CLOUDS COVER THE REGION AROUND THE VOLCANO MAKING ASH DETECTION DIFFICULT. MULTISPECTRAL IMAGERY THROUGH 11/0515 UTC DOES NOT SHOW ANY EVIDENCE OF ASH. . TRAJECTORY: UPPER AIR FORECAST MODELS INDICATE THAT ASH TO FL240 WOULD MOVE EAST AT 1O TO 15 KTS. . 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 11/1200. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . TURK . NNNN