FVXX21 KWBC 011330 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1330 UTC 01 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-191 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE..MULTISPECTRAL AND INFRARED IMAGERY. AVIATION MODEL WIND FORECAST REPORT FROM THE GEOFISICO INSTITUTO. . ERUPTION DETAILS: CONTINUOUS STEAM AND ASH EMISSIONS AND OCCASIONAL EXPLOSIONS OF ASH. . DETAILS OF ASH: THE LATEST SATELLITE DATA THROUGH 01/1245 UTC SHOWS A THIN PLUME EXTENDING TO THE NORTH AWAY FROM THE SUMMIT. THE PLUME IS 83 KM (45 NMI) IN LENGTH 9 KM (5 NMI) WIDE AND EXTENDS TO THE POINT 0.7S 78.6W. . UPPER AIR PATTERNS SUGGEST THAT THE OBSERVED ASH IS AT FL320. . TRAJECTORY: ASH IS MOVING TOWARD THE NORTH AT 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 01/1930 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . WALTER/SAB/NOAA/NESDIS . NNNN