FVXX21 KWBC 132330 VOLCANIC ASH ADVISORY ISSUED 2330 UTC 13 SEP 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-1074 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: INFRARED AND MULTISPECTRAL SATELLITE IMAGERY. UPPER WINDS FORECAST FROM THE AVIATION MODEL. THE GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: OCCASIONAL STEAM AND ASH EMISSIONS. . DETAILS OF ASH: NO ASH WAS DETECTED IN SATELLITE IMAGERY THROUGH 13/2245 UTC. SCATTERED CLOUDS IN THE AREA HAVE OBSCURED THE VIEW OF THE SUMMIT THOUGH. THE GEOPHYSICAL INSTITUTE REPORTS THAT THE VOLCANO HAS BEEN RELATIVELY QUIET THE PAST 24 HOURS WITH ONLY A FEW ASH EMISSIONS. . TRAJECTORY: ANY ASH AT OR NEAR SUMMIT LEVEL WOULD MOVE TOWARD THE WEST AT ABOUT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 14/0530 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. . CLARK . NNNN