FVXX21 KWBC 290430 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0430 UTC 29 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-181 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 MULTISPECTRAL AND INFRARED IMAGERY...REPORT FROM THE GEOFISICO INSTITUTO...1800 UTC AVIATION MODEL WIND FORECAST . ERUPTION DETAILS: CONTINUOUS STEAM EMISSIONS AND SOME ASH EMISSIONS . DETAILS OF ASH: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 0345 UTC PERHAPS BECAUSE LOW AND MIDDLE LEVEL WEATHER CLOUDS HAMPER ASH DETECTION. UNDER CLEARER SKIES SIX HOURS AGO ASH AT ABOUT FL300 WAS OBSERVED EXTENDING FROM THE SUMMIT TOWARD THE WEST SOUTHWEST. THE GEOFISICO INSTITUTO REPORTS THAT THE VOLCANIC EMISSIONS YESTERDAY WERE PRIMARILY STEAM. HOWEVER THEY ALSO REPORT THAT SOME ASH EMISSIONS DID OCCUR YESTERDAY AND ON AT LEAST ONE OCCASION A PROLONGED ASH EMISSION TO FL240 WAS OBSERVED. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH AT ABOUT FL300 WILL MOVE TO THE WEST SOUTHWEST AT 15 KNOTS. . 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/) . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 29/1030 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN