FVXX21 KWBC 181600 VOLCANIC ASH ADVISORY ISSUED 1600 UTC 18 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-839 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL IMAGERY. 12 HOUR WIND FORECAST FROM THE 18/0600 UTC AVIATION RUN. . ERUPTION DETAILS: GASES WITH OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: ASH IS NOT SEEN IN THE SATELLITE IMAGERY THROUGH 18/1515 UTC. HOWEVER SEVERAL PILOT REPORTS INDICATE ASH OVER THE VOLCANO TO FL240 MOVING TOWARD THE NORTHEAST. . TRAJECTORY: CURRENT MODEL DATA INDICATE LIGHT AND VARIABLE WINDS FROM THE SUMMIT LEVEL TO FL240. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 18/2200 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