FVXX21 KWBC 120430 VOLCANIC ASH ADVISORY ISSUED 0430 UTC 12 JUN 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-686 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: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: A GUAYAQUIL METEOROLOGICAL WATCH OFFICE SIGMET REPORTS THAT THE GEOPHYSICAL INSTITUTE OBSERVED ASH TO FL260 OVER THE VOLCANO AT 12/0232 UTC. NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 12/0345 UTC BUT ASH DETECTION IS HINDERED BY THE LOW LEVEL WEATHER CLOUDS COVERING THE AREA. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN THE SUMMIT AND FL260 WOULD MOVE WEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 12/1030 UTC. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER 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