FVXX21 KWBC 180030 VOLCANIC ASH ADVISORY ISSUED 0030 UTC 18 JUN 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-710 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 AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 18/2345 UTC SHOWS EXTENSIVE CLOUDINESS OVER THE VOLCANO MAKING ANY DETECTION OF ASH DIFFICULT. POSSIBLE ASH WAS OBSERVED EARLIER IN THE DAY EXTENDING TO THE WEST OF SOUTHWEST OF THE VOLCANO. THIS ASH WAS ESTIMATED AT A HEIGHT BELOW FL260. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH FROM THE SUMMIT TO FL260 WOULD MOVE TOWARD THE WEST OR SOUTHWEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 18/0630 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