FVXX21 KWBC 291230 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1230 UTC 29 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-502 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. SIX HOUR FORECAST FROM THE 29/0600 UTC AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 29/1145 UTC SHOWS LOW TO MID LEVEL CLOUDS OVER THE AREA MAKING DETECTION OF ASH DIFFICULT. THE GEOPHYSICAL INSTITUTE HOWEVER DID REPORT PROBABLE ASH OVER THE SUMMIT AT 29/0642 UTC. NO HEIGHT ASSIGNMENT WAS GIVEN. . TRAJECTORY: ANY ASH BETWEEN THE SUMMIT AND FL250 WOULD MOVE TOWARDS THE WEST AT ABOUT 20 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 29/1830 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. . NNNN