FVXX21 KWBC 210500 VOLCANIC ASH ADVISORY ISSUED 0500 UTC 21 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-849 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. WINDS FORECAST FROM THE AVIATION MODEL. GEOPHYSICAL INSTITUTE REPORT. . ERUPTION DETAILS: GASES WITH OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: ASH IS NOT VISIBLE IN THE SATELLITE IMAGERY THROUGH 21/0415 UTC ALTHOUGH THERE ARE EXTENSIVE CLOUDS IN THE AREA. AS OF 21/0310 UTC THE GEOPHYSICAL INSTITUTE REPORTED ASH OVER THE VOLCANO MOVING WEST. NO HEIGHT ESTIMATE WAS GIVEN. . TRAJECTORY: ASH FROM THE SUMMIT TO FL260 WOULD MOVE TOWARDS THE SOUTHWEST AT 10-20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 21/1100 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. . NNNN