FVXX21 KWBC 230800 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0800 UTC 23 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-155 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. THE GEOFISICO INSTITUTO. 23/0000 UTC AVIATION MODEL UPPER-AIR SOUNDING DATA. . ERUPTION DETAILS: CONTINUOUS ASH AND GAS EMISSIONS...AND OCCASIONAL EXPLOSIONS AS REPORTED BY THE GEOFISICO INSTITUTO. . DETAILS OF ASH: THE LATEST GOES-8 SATELLITE DATA THROUGH 23/0715 UTC SHOWS EXTENSIVE MULTI-LAYERED CLOUDS SHROUDING THE AREA AROUND THE VOLCANO THUS MAKING DETECTION OF ASH IMPOSSIBLE. . TRAJECTORY: ANY ASH AT FL350 WOULD MOVE TOWARD THE SOUTHWEST AT 10-15KT. . 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 23/1400 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . WALTER/SAB/NOAA/NESDIS . NNNN