FVXX21 KWBC 261850 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1850 UTC 26 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-491 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. UPPER WINDS FORECAST FROM THE AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: VISIBLE SATELLITE IMAGERY THROUGH 1745 UTC SHOWED AN ASH PLUME EXTENDING 28KM (15NMI) TO THE WEST NORTHWEST. THE PLUME ESTIMATED TO FL300 IS 8KM (4NMI) WIDE. ASH FARTHER WEST HAS BECOME TOO DIFFUSE TO DETECT. GOES-8 WILL BE IN RAPID SCAN MODE THROUGH 2026 UTC TO SUPPORT NASA OPERATIONS. . TRAJECTORY: TOWARDS THE WEST NORTHWEST AT 15 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 27/0100 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. . BROWN . NNNN