FVXX21 KWBC 202300 VOLCANIC ASH ADVISORY ISSUED 2300 UTC 20 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-848 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL IMAGERY. WINDS FORECAST FROM THE AVIATION MODEL. GEOPHYSICAL INSTITUTE REPORT. . ERUPTION DETAILS: GASES WITH OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: ASH WAS NOT DETECTED IN THE SATELLITE IMAGERY THROUGH 20/2215 UTC ALTHOUGH THERE ARE EXTENSIVE CLOUDS IN THE AREA. THE GEOPHYSICAL INSTITUTE REPORTED AN EXPLOSION AT 20/1941 UTC THAT PRODUCED A LARGE AMOUNT OF ASH OVER THE SUMMIT TO FL260. AS OF 20/2200 UTC THE GEOPHYSICAL INSTITUTE HAD RECEIVED NO REPORTS OF ASH FALL NEAR THE CITY OF AMBATO OR OTHER AREAS SOUTH AND WEST OF THE VOLCANO. TRAJECTORY: ASH FROM THE SUMMIT TO FL260 WOULD MOVE TOWARDS THE SOUTHWEST AT 5-15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 21/0500 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. . CLARK . NNNN