FVXX21 KWBC 010730 VOLCANIC ASH ADVISORY ISSUED 0730 UTC 01 AUG 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-897 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED...AND MULTISPECTRAL IMAGERY. 6 HOUR WIND FORECAST FROM THE 01/0000 UTC AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL EMISSIONS OF ASH AND STEAM. . DETAILS OF ASH: GOES-8 IMAGERY THROUGH 0645 UTC SHOWS WIDESPREAD CLOUDINESS OVER THE VOLCANO MAKING IT DIFFICULT TO DETECT ASH AT THIS TIME. THE VOLCANO REMAINS UNSTABLE AND MAY ERUPT AT ANY TIME. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH AT NEAR SUMMIT LEVEL WOULD MOVE TOWARDS THE SOUTHWEST AT 10 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 01/1330 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