FVXX21 KWBC 231930 VOLCANIC ASH ADVISORY ISSUED 1930 UTC 23 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-862 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE AND INFRARED AND MULTISPECTRAL IMAGERY. UPPER AIR FORECAST FROM THE AVIATION MODEL. SIGMET FROM GUAYAQUIL MWO. . ERUPTION DETAILS: OCCASIONAL EMISSIONS OF ASH AND STEAM. . DETAILS OF ASH: AN AIRCRAFT OBSERVATION NEAR THE VOLCANO AT 23/1305 UTC REPORTED ASH NEAR SUMMIT LEVEL. SATELLITE IMAGERY THROUGH 23/1845 UTC SHOWS CLOUDINESS OVER THE VOLCANO MAKING ANY DETECTION OF ASH DIFFICULT. . TRAJECTORY: ANY ASH AT NEAR SUMMIT WOULD MOVE TOWARDS THE WEST AT 15 TO 20 KTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 24/0130 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. . KARST . NNNN