FVXX21 KWBC 110830 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0820 UTC 11 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-233 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...U.S. NUMERICAL MODEL WIND FORECASTS . ERUPTION DETAILS: CONTINUOUS EMISSION OF ASH AND STEAM WITH OCCASIONAL LARGER PUFFS . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 0745 UTC INDICATED WEAKENING THUNDERSTORMS IN THE VICINITY OF THE VOLCANO. THE CONVECTIVE DEBRIS FROM THESE THUNDERSTORMS PRECLUDED THE DETECTION OF LOWER LEVEL ASH IN SATELLITE IMAGERY. . TRAJECTORY: ANY ASH UP TO FL250 WOULD MOVE TOWARDS THE WEST AT 10 TO 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. . EFFECTIVE JANUARY 3 2000 AT 0000 UTC... ALL REFERENCES TO LATITUDE AND LONGITUDE IN VOLCANIC ASH ADVISORY STATEMENTS WILL BE IN DEGREES AND MINUTES OF A DEGREE. EXAMPLE: 16.70N 62.20W WILL BE 1642N6212W . THE NEXT STATEMENT WILL BE ISSUED BY 11/1430 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . TURK . NNNN