FVXX21 KWBC 201900 VOLCANIC ASH ADVISORY ISSUED 1900 UTC 20 JUN 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-721 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 20/1200 UTC AVIATION MODEL. GEOPHYSICAL INSTITUTE. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 20/1815 UTC SHOWS CLOUDS OVER THE AREA OF THE VOLCANO MAKING DETECTION OF ASH DIFFICULT. IN ADDITION THE ASH SEEN EARLIER THIS MORNING IS NO LONGER VISIBLE. HOWEVER..AT 20/1651 UTC..THE GEOPHYSICAL INSTITUTE DID REPORT ASH OVER THE SUMMIT TO FL220. . TRAJECTORY: ASH FROM THE SUMMIT TO FL220 WILL MOVE TOWARDS THE WEST AT 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 21/0100 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