FVXX21 KWBC 071030 VOLCANIC ASH ADVISORY ISSUED 1030 UTC 07 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-793 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. SIX HOUR WIND FORECAST FROM THE 07/0600 UTC AVIATION MODEL. SIGMET FROM GUAYAQUIL METEOROLOGICAL WATCH OFFICE. . ERUPTION DETAILS: GAS AND OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: ASH IS NOT SEEN IN THE SATELLITE IMAGERY THROUGH 07/1045 UTC. HOWEVER AT 07/0702 UTC THE GEOPHYSICAL INSTITUTE REPORTED POSSIBLE VOLCANIC ASH OVER THE VOLCANO AT UNKNOWN HEIGHT. . TRAJECTORY: ANY ASH BETWEEN THE SUMMIT AND FL220 WOULD MOVE TOWARDS THE WEST AT 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 07/1730 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. . WALTER . NNNN