FVXX21 KWBC 211930 VOLCANIC ASH ADVISORY ISSUED 1930 UTC 21 JUN 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-725 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL IMAGERY. 6 HOUR WIND FORECAST FROM THE 21/1200 UTC AVIATION MODEL. GEOPHYSICAL INSTITUTE. . ERUPTION DETAILS: NEARLY CONTINUOUS GAS AND OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 21/1845 UTC SHOWS EXTENSIVE CLOUDS OVER AND AROUND THE AREA OF THE VOLCANO MAKING DETECTION OF ASH DIFFICULT. THE LAST OBSERVATION OF ASH WAS AT 21/1025 UTC. AT THAT TIME THE GEOPHYSICAL INSTITUTE DID REPORT ASH OVER THE SUMMIT BUT DID NOT INDICATE A HEIGHT. . TRAJECTORY: ANY ASH THAT MAY EXIST BETWEEN THE SUMMIT AND FL220 WOULD MOVE TOWARDS THE WEST AT 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 22/0130 UTC. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH ADVISORIES 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