FVXX21 KWBC 111400 VOLCANIC ASH ADVISORY ISSUED 1400 UTC 11 SEP 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-1064 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: VISIBLE AND INFRARED AND MULTISPECTRAL IMAGERY. WIND FORECAST FROM THE AVIATION MODEL. GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: STEAM AND ASH EMISSIONS. . DETAILS OF ASH: VISIBLE SATELLITE IMAGERY THROUGH 1315 UTC SHOWS SCATTERED LOW AND MID LEVEL CLOUDS OVER THE VOLCANO. THERE IS NO EVIDENCE OF VOLCANIC ASH IN THE VICINITY OF THE VOLCANO. HOWEVER, THE VOLCANO REMAINS UNSTABLE AND MAY ERUPT AT ANYTIME. . TRAJECTORY: ANY ASH AT NEAR SUMMIT LEVEL WOULD MOVE TOWARDS THE SOUTHWEST AT 15 TO 25 KTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 11/2000 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