FVXX21 KWBC 081300 VOLCANIC ASH ADVISORY ISSUED 1300 UTC 08 SEP 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-1052 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE AND INFRARED AND MULTISPECTRAL IMAGERY. SIX HOUR WIND FORECAST FROM THE 08/0600 UTC AVIATION MODEL. GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 1215 UTC SHOWS LOW AND MID LEVEL CLOUDS OVER THE VOLCANO MAKING IT DIFFICULT TO DETECT ASH. THE LAST OBSERVATION OF ASH FROM THE GEOPHYSICAL INSTITUTE WAS AT 07/1838 UTC WITH ASH BETWEEN FL190 AND FL220. THE VOLCANO REMAINS UNSTABLE AND MAY ERUPT AT ANY TIME. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL220 WILL MOVE TOWARDS THE WEST AT 5 TO 10 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 08/1900 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. . KARST . NNNN