FVXX21 KWBC 151900 VOLCANIC ASH ADVISORY ISSUED 1900 UTC 15 JUN 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-701 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE...INFRARED AND MULTISPECTRAL IMAGERY. THE GEOPHYSICAL INSTITUTE IN QUITO. 15/1800 UTC FORECAST UPPER WINDS FROM THE 15/0600 UTC AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: LOW CLOUDS HAVE OBSCURED THE VIEW OF THE VOLCANO. PREVIOUS SATELLITE IMAGERY WITH AN UNOBSCURED VIEW SHOWED NO SIGNS OF ANY ASH AT OR NEAR THE VOLCANO TODAY. THE INSTITUTE REPORTS THAT THE VOLCANO HAS BEEN VERY QUIET IN THE PAST 12 HOURS. TUNGURAHUA REMAINS IN A VERY ACTIVE STATE AND COULD PRODUCE SIGNIFICANT ASH AT ANYTIME. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH AT THE SUMMIT WOULD MOVE SOUTHWEST AT 10 KNOTS AND ANY ASH ABOVE THE SUMMIT WOULD MOVE WEST AT 10 TO 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 16/0100 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. . HUGHES . NNNN