FVXX21 KWBC 251900 VOLCANIC ASH ADVISORY ISSUED 1900 UTC 25 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-870 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE...INFRARED...AND MULTISPECTRAL IMAGERY. 25/1800 UTC FORECAST UPPER WINDS FROM THE 25/1200Z AVIATION MODEL. THE GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: OCCASIONAL EMISSIONS OF ASH AND STEAM. . DETAILS OF ASH: GOES-8 IMAGERY THROUGH 1845 UTC SHOWS LOW AND MID LEVEL CLOUDS OBSCURING THE VIEW OF THE VOLCANO. THE ASH CLOUD FROM THE EARLIER EMISSION HAS MOVED WEST AND DISSIPATED. THE VOLCANO HAS REMAINED QUIET SINCE THIS MORNINGS EMISSION. THE VOLCANO REMAINS IN A VERY ACTIVE STATE AND COULD PRODUCE ASH AT ANYTIME. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH UP TO FL300 TO MOVE WEST AT 10 TO 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 26/0100 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. . HUGHES . NNNN