FVXX21 KWBC 040720 VOLCANIC ASH ADVISORY ISSUED 0720 UTC 04 SEP 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-1035 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. WIND FORECAST FROM THE AVIATION MODEL. SIGMET FROM GUAYAQUIL METEOROLOGICAL WATCH OFFICE. . ERUPTION DETAILS: GAS AND ASH EMISSIONS. . DETAILS OF ASH: NO ASH CAN BE DETECTED IN SATELLITE IMAGERY THROUGH 04/0645 UTC DUE TO EXTENSIVE CLOUD COVER IN THE VICINITY OF THE SUMMIT. THE LAST REPORT (03/1710 UTC) FROM THE GEOPHYSICAL INSTITUTE INDICATED VOLCANIC ASH OVER THE VOLCANO TO FL220 MOVING TO THE WEST SOUTHWEST. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN THE SUMMIT AND FL220 WOULD MOVE TO THE WEST AT ABOUT 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT ADVISORY WILL BE ISSUED BY 04/1330 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. . TURK . NNNN