FVXX21 KWBC 211710 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1700 UTC 21 FEB 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-221 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: THE GEOPHYSICAL INSTITUTE IN QUITO. GOES-8 VISIBLE AND INFRARED AND MULTISPECTRAL IMAGERY. . ERUPTION DETAILS: OCCASIONAL EMISSIONS OF ASH AND STEAM. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 1615 UTC SHOWS MID AND HIGH LEVEL CLOUDS OVER THE VOLCANO MAKING ANY DETECTION OF ASH OR STEAM DIFFICULT. THE GEOPHYSICAL INSTITUE IN QUITO REPORTS THAT THE VOLCANO REMAINS UNSTABLE AND THAT AN EXPLOSION OF ASH OR STEAM COULD OCCUR AT ANY TIME. TRAJECTORY: N/A. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 21/2300 UTC. . 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/) . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . KARST . NNNN