FVXX20 KWBC 200700 VOLCANIC ASH ADVISORY ISSUED 0700 UTC 20 JUL 2000 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 00-173 ECUADOR 0011S 7836W . BACKGROUND: GUAGUA PICHINCHA ECUADOR (1502-02) SUMMIT HEIGHT 15695 FT (4784 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. 20/0600 UTC FORECAST UPPER WINDS FROM THE 20/0000 UTC AVN MODEL RUN. GEOPHYSICAL INSTITUTE REPORT . ERUPTION DETAILS: ASH EMISSION AT 20/0611 UTC. . DETAILS OF ASH CLOUD: GOES-8 IMAGERY THROUGH 0645 UTC SHOWS NO ASH ALTHOUGH THERE ARE EXTENSIVE CLOUDS IN THE AREA. THE GEOPHYSICAL INSTITUTE REPORTED SEISMIC ACTIVITY INDICATING A LIKELY EMISSION OF ASH TO AN UNKNOWN ALTITUDE BUT MOST LIKELY ONLY SLIGHTLY ABOVE SUMMIT LEVEL. TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH NEAR SUMMIT LEVEL WOULD MOVE SOUTHWEST AT ABOUT 10 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT ADVISORY WILL BE ISSUED BY 20/1300 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