FVXX21 KWBC 172215 VOLCANIC ASH ADVISORY ISSUED 2215 UTC 17 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-836 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE AND INFRARED IMAGERY. GEOPHYSICAL INSTITUTE REPORT. WINDS FORECAST FROM THE AVIATION MODEL. SURFACE REPORT FROM RIOBAMBA. PILOT REPORT. . ERUPTION DETAILS: GASES WITH OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: A SMALL ASH PLUME WAS VISIBLE ON SATELLITE IMAGERY AT 17/2115 UTC EXTENDING FROM THE SUMMIT TOWARD THE SOUTHWEST. A SURFACE REPORT FROM RIOBAMBA CONFIRMED ASH OVER THE VOLCANO DRIFTING TOWARD THE SOUTHWEST. AT 17/2115 UTC THE PLUME EXTENDED ROUGHLY 6 KM (3 NMI) FROM THE SUMMIT. THE PLUME IS ESTIMATED AT FL300 BASED ON EARLIER GEOPHYSICAL INSTITUTE REPORTS. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL300 WILL MOVE SOUTHWEST AT 10 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 18/0400 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. . CLARK . NNNN