FVXX21 KWBC 301000 VOLCANIC ASH ADVISORY ISSUED 1000 UTC 30 JUN 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-763 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. WINDS FORECAST FROM THE AVIATION MODEL. GEOPHYSICAL INSTITUTE. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 30/0915 UTC SHOWS EXTENSIVE LOW AND MID LEVEL CLOUDINESS AROUND THE VOLCANO MAKING ANY DETECTION OF ASH DIFFICULT. THE VOLCANO REMAINS UNSTABLE AND AN ERUPTION MAY OCCUR AT ANYTIME. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL200 WOULD MOVE TOWARDS THE WEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 30/1600 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. . KARST . NNNN