FVXX21 KWBC 252100 VOLCANIC ASH ADVISORY ISSUED 2100 UTC 25 AUG 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-0996 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. SIX HOUR WIND FORECAST FROM THE 25/1200 UTC AVIATION MODEL. . ERUPTION DETAILS: GAS AND OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: ASH IS NOT SEEN IN THE SATELLITE IMAGERY THROUGH 25/2015 UTC. THE MOST RECENT ASH REPORT FROM THE GEOPHYSICAL INSTITUTE WAS AT 25/0339 UTC WITH HEIGHT UNKNOWN.. . TRAJECTORY: ANY ASH AT SUMMIT LEVEL WILL MOVE TOWARDS THE WEST AT 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT ADVISORY WILL BE ISSUED BY 26/0300 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