FVXX21 KWBC 281830 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1830 UTC 28 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-499 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. 6 HOUR FORECAST FROM THE 28/1200 UTC AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 28/1745 UTC SHOWS EXTENSIVE CLOUDS OVER THE AREA MAKING DETECTION OF ASH DIFFICULT. THE GEOPHYSICAL INSTITUTE HOWEVER DID REPORT ASH OVER THE SUMMIT MOVING WEST AT 28/1631 UTC WITH NO GIVEN HEIGHT. . TRAJECTORY: ASH TO FL250 WOULD MOVE TOWARDS THE WEST AT 20 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 29/0030 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