FVXX21 KWBC 181830 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1830 UTC 18 MAY 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-584 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL IMAGERY. GEOPHYSICAL INSTITUTE REPORT. 6 HOUR WIND FORECAST FROM THE 18/1200 UTC AVIATION MODEL. . ERUPTION DETAILS: NEARLY CONTINUOUS GAS AND OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 18/1745 UTC SHOWS EXTENSIVE LAYERED CLOUDS OVER THE AREA OF THE VOLCANO MAKING DETECTION OF ASH DIFFICULT. HOWEVER..THE GEOPHYSICAL INSTITUTE DID REPORT ASH OVER THE SUMMIT AT 18/1503 UTC TO FL260. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL260 WILL MOVE TOWARD THE WEST AT 20 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 19/0030 UTC. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH ADVISORY STATEMENTS 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. . WALTER . NNNN