FVXX21 KWBC 280030 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0030 UTC 28 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-496 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. GEOPHYSICAL INSTITUTE. FORECAST FROM THE 27/1200 UTC AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 27/2245 UTC SHOWS LOW AND MID LEVEL CLOUDS OVER THE VOLCANO MAKING ANY DETECTION OF ASH AND STEAM DIFFICULT. BOTH THE GEOPHYSICAL INSTITUTE AND A SURFACE OBSERVATION FROM CHIMBORAZO REPORTS VOLCANIC ASH OVER THE VOLCANO. THE LATEST OBSERVATION PLACED THE ASH AT FL240. . TRAJECTORY: ASH UP TO FL240 WOULD MOVE TOWARDS THE WEST AT 20 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 28/0630 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. . KARST . NNNN