FVXX21 KWBC 291610 VOLCANIC ASH ADVISORY ISSUED 1610 UTC 29 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-886 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. SIGMET FROM GUAYAQUIL METEOROLOGICAL WATCH OFFICE. SIX HOUR WIND FORECAST FROM THE AVIATION MODEL. REPORT FROM THE GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: EMISSIONS OF ASH AND STEAM. . DETAILS OF ASH: A SIGMET FROM GUAYAQUIL CITES AIRCRAFT OBSERVATION OF VOLCANIC ASH OVER THE VOLCANO TO FL250. NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 29/1545 UTC DUE TO THE LOW WEATHER CLOUDS COVERING THE AREA. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ASH BETWEEN THE SUMMIT AND FL250 WILL MOVE TOWARD THE WEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 29/2200 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