FVXX21 KWBC 232015 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2015 UTC 23 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-285 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE AND INFRARED AND MULTISPECTRAL IMAGERY...GEOPHYSICAL INSTITUTE REPORT...1200 UTC AVIATION MODEL WIND FORECAST. . ERUPTION DETAILS: NEW ASH PLUME AT 23/1315 UTC. . DETAILS OF ASH: THE LATEST SATELLITE IMAGERY THRU 1945 UTC SHOWS THAT THE PLUME OBSERVED EARLIER MOVING TOWARDS THE SOUTHWEST FROM THE SUMMIT IS OBSCURED BY CLOUDS AT THIS TIME. AS A RESULT WE ARE UNABLE TO DETECT VOLCANIC ASH IN THE IMAGERY. . TRAJECTORY: ANY ASH BETWEEN FL160 AND FL230 WILL MOVE TO THE SOUTHWEST AT 15 TO 20 KTS. . 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. . 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 24/0215 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . KARST . NNNN