FVXX21 KWBC 291830 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1830 UTC 29 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-503 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 29/1200 UTC AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 29/1745 UTC SHOWS BROKEN LOW TO MID LEVEL CLOUDS OVER THE AREA MAKING DETECTION OF ASH DIFFICULT. THE MOST RECENT GEOPHYSICAL INSTITUTE REPORT HAD 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 30/0030 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. . NNNN