FVXX21 KWBC 210700 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0700 UTC 21 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-468 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. 6 HOUR WIND FORECAST FROM THE 21/0000 UTC AVIATION MODEL. THE GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: GOES-8 IMAGERY THROUGH 21/0615 UTC CONTINUES TO SHOW EXTENSIVE CLOUDINESS OVER THE AREA MAKING ASH DETECTION DIFFICULT. AT 21/0303 UTC THE GEOPHYSICAL INSTITUTE REPORTED ASH OVER THE VOLCANO HOWEVER NO HEIGHT WAS GIVEN. . TRAJECTORY: ANY ASH UP TO FL300 WOULD MOVE WEST-SOUTHWEST AT 20 KNOTS. . THE NEXT STATEMENT WILL BE ISSUED BY 21/1300 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. . WALTER . NNNN