FVXX21 KWBC 090100 VOLCANIC ASH ADVISORY ISSUED 0100 UTC 09 SEP 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-1054 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 08/1800 UTC AVIATION MODEL. GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 09/0015 UTC SHOWS CLOUDINESS AROUND THE SUMMIT MAKING IT DIFFICULT TO DETECT ASH. THE VOLCANO REMAINS UNSTABLE AND MAY ERUPT AT ANY TIME. THE GEOPHYSICAL INSTITUTE REPORTED ASH OVER THE SUMMIT AT 08/2220 UTC TO FL180. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL180 WILL MOVE TOWARDS THE WEST-NORTHWEST AT 5-10 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 09/0700 UTC. . REAL TIME SATELLITE IMAGERY AND 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