FVXX21 KWBC 171200 VOLCANIC ASH ADVISORY ISSUED 1200 UTC 17 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-833 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL IMAGERY. GEOPHYSICAL INSTITUTE REPORT. 6 HOUR WIND FORECAST FROM THE 17/0600 UTC AVIATION MODEL. . ERUPTION DETAILS: GASES WITH OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: ASH IS NOT DETECTED ON THE SATELLITE IMAGERY THROUGH 17/1145 UTC. THE LAST REPORT OF ASH BY THE GEOPHYSICAL INSTITUTE WAS AT 16/1659 UTC WITH ASH TO FL280. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL280 WOULD MOVE WEST AT 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 17/1800 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