FVXX21 KWBC 181500 VOLCANIC ASH ADVISORY ISSUED 1500 UTC 18 AUG 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-967 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE... INFRARED AND MULTISPECTRAL IMAGERY. UPPER LEVEL WIND FORECAST FROM THE AVIATION MODEL. GEOPHYSICAL INSTITUTE REPORT. . ERUPTION DETAILS: GASES AND OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: NO ASH WAS DETECTED IN GOES-8 IMAGERY THROUGH 1415 UTC AND THICK WEATHER CLOUDS COVER THE AREA. THE INSTITUTE REPORTS THAT THE VOLCANO REMAINS ACTIVE WITH SMALL NEAR SUMMIT EMISSIONS. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH BELOW FL230 WILL MOVE TOWARD THE WEST NORTHWEST AROUND 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT ADVISORY WILL BE ISSUED BY 18/2100 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. . . NNNN