FVXX21 KWBC 231400 VOLCANIC ASH ADVISORY ISSUED 1400 UTC 23 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-861 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: SATELLITE IMAGERY THROUGH 23/1345 UTC SHOWS DENSE CLOUDINESS OVER THE VOLCANO MAKING ANY DETECTION OF ASH DIFFICULT. AN AIRCRAFT OBSERVATION REPORTS ASH OVER THE VOLCANO AT NEAR SUMMIT LEVEL. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL200 WOULD MOVE TO THE WEST AT 10 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 23/2000 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