FVXX21 KWBC 281230 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1230 UTC 28 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-498 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL IMAGERY. 6 HOUR FORECAST FROM THE 28/0600 UTC AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 28/1145 UTC SHOWS A VERY FAINT AND THIN PLUME EXTENDING TO THE WEST AWAY FROM THE SUMMIT. THIS PLUME IS 14 KM (8 NMI) IN LENGTH AND 2 KM (1 NMI) IN WIDTH. THE PLUME EXTENDS TO THE POINT: 0126S 7833W. HEIGHT OF ASH MOVING IN THIS DIRECTION WOULD BE FROM THE SUMMIT TO FL250 BASED ON WIND FORECAST DATA. . TRAJECTORY: ASH TO FL250 WOULD MOVE TOWARDS THE WEST AT 20 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 28/1830 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