FVXX21 KWBC 131730 VOLCANIC ASH ADVISORY ISSUED 1730 UTC 13 SEP 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-1073 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE...INFRARED...AND MULTISPECTRAL IMAGERY. 13/1800 UTC UPPER WINDS FORECAST FROM THE 13/0600 UTC AVIATION MODEL. THE GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: OCCASIONAL STEAM AND ASH EMISSIONS. . DETAILS OF ASH: GOES-8 IMAGERY THROUGH 1715 UTC DID NOT INDICATE THE PRESENCE OF ASH DUE TO BROKEN TO OVERCAST MID AND HIGH LEVEL CLOUDS OBSCURING THE VIEW OF THE VOLCANO. THE GEOPHYSICAL INSTITUTE REPORTS THAT THERE HAVE BEEN FEW ASH EMISSIONS BUT THE VOLCANO HAS BEEN VERY QUIET IN THE PAST 24 HOURS. THE VOLCANO REMAINS ACTIVE AND COULD PRODUCE AN ASH PLUME AT ANYTIME. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH AT OR NEAR SUMMIT LEVEL TO MOVE WEST NORTHWEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 13/2330 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. . HUGHES . NNNN