FVXX21 KWBC 121600 VOLCANIC ASH ADVISORY ISSUED 1600 UTC 12 JUN 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-688 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL IMAGERY. WIND FORECAST FROM THE AVIATION MODEL. GEOPHYSICAL INSTITUTE REPORT. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 12/1515 UTC BUT ASH DETECTION CONTINUES TO BE HINDERED BY LOW LEVEL CLOUDS OVER THE AREA. THE GEOPHYSICAL INSTITUTE REPORTS THAT THERE HAS BEEN NO SEISMIC ACTIVITY AT THE VOLCANO OVER THE LAST 10 HOURS. ASH WAS LAST REPORTED AT 12/0232 UTC AND WAS ESTIMATED TO FL260. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN THE SUMMIT AND FL260 WOULD MOVE TOWARD THE WEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 12/2200 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. . CLARK . NNNN