FVXX21 KWBC 161630 VOLCANIC ASH ADVISORY ISSUED 1630 UTC 16 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-829 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. GEOPHYSICAL INSTITUTE REPORT. WIND FORECAST FROM THE AVIATION MODEL. . ERUPTION DETAILS: GASES WITH OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 16/1545 UTC SHOWS EXTENSIVE LOW AND MID LEVEL CLOUDINESS OVER THE VOLCANO MAKING IT DIFFICULT TO DETECT ANY ASH. THE GEOPHYSICAL INSTITUTE REPORTED ASH AT FL250 OVER THE VOLCANO AT 15/2250 UTC. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL250 WILL MOVE TOWARDS THE WEST AT 20 TO 25 KTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 16/2230 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. . NNNN