FVXX21 KWBC 071900 VOLCANIC ASH ADVISORY ISSUED 1900 UTC 07 SEP 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-1049 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE...INFRARED...AND MULTISPECTRAL IMAGERY. 07/1800 HOUR WIND FORECAST FROM THE 07/1200 UTC AVIATION MODEL. GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: GOES-8 IMAGERY THROUGH 1745 UTC SHOWS LOW AND MID LEVEL CLOUDS OVER THE VOLCANO MAKING IT DIFFICULT TO DETECT ANY ASH. THE GEOPHYSICAL INSTITUTE REPORTS ASH OVER THE VOLCANO TO FL260 AT 07/1610 UTC. ANOTHER OBSERVATION AT 07/1838 UTC REPORTS ASH TO FL220. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH FROM THE SUMMIT TO FL260 WOULD MOVE TOWARDS THE WEST SOUTHWEST AT 10 TO 15 KTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 08/0100 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