FVXX21 KWBC 300730 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0730 UTC 30 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-186 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 MULTISPECTRAL AND INFRARED SATELLITE IMAGERY...REPORT FROM THE GEOFISICO INSTITUTO...AVIATION MODEL WIND FORECAST . ERUPTION DETAILS: CONTINUOUS STEAM AND ASH EMISSIONS AND OCCASIONAL EXPLOSIONS OF ASH. . DETAILS OF ASH: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 0645 UTC. HOWEVER ASH DETECTION IS HINDERED BY THE PRESENCE OF LOW AND SOME MID LEVEL WEATHER CLOUDS. ABOUT 12 HOURS AGO UNDER CLEARER SKIES WESTWARD MOVING ASH AT ABOUT FL300 WAS OBSERVED. YESTERDAY AFTERNOONS REPORT FROM THE GEOFISICO INSTITUTO INDICATES THAT THE VOLCANO CONTINUES TO EMIT GASES AND ASH BELOW FL250. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN FL240 AND FL300 WOULD MOVE TO THE WEST AT LESS THAN 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 30/1330 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN