FVXX21 KWBC 281040 VOLCANIC ASH ADVISORY ISSUED 1040 UTC 28 JUN 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-755 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. THE GEOPHYSICAL INSTITUTE IN QUITO. 12 HOUR FORECAST WINDS FROM THE 00 UTC AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: NO ASH PLUME IS CURRENTLY VISIBLE IN SATELLITE IMAGERY THROUGH 28/0945 UTC. SCATTERED CLOUDS OVER THE SUMMIT ARE MAKING ASH DETECTION DIFFICULT. THE LATEST INFORMATION FROM THE GEOPHYSICAL INSTITUTE AT 0327 UTC PLACED ASH OVER THE VOLCANO MOVING WEST. . TRAJECTORY: ANY ASH UP TO FL270 WOULD MOVE WESTWARD AT 10 TO 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 28/1700 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