FVXX21 KWBC 140125 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0125 UTC 14 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-244 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY...U.S. NUMERICAL MODEL WIND FORECASTS...GEOPHYSICAL INSTITUTE... . ERUPTION DETAILS: CONTINUOUS VENTING OF LIGHT ASH AND STEAM...OCCASIONAL WEAK TO MODERATE EXPLOSIONS WITH THICKER ASH . DETAILS OF ASH: GOES-8 IMAGERY THOUGH 14/0045 UTC INDICATES EXTENSIVE MULTILAYERED CLOUDINESS DUE TO NEARBY SHOWER AND THUNDERSTORM ACTIVITY. NO ASH IS DISCERNIBLE AT THIS TIME. HOWEVER THERE WAS AN ASH PLUME NOTED EARLIER THIS AFTERNOON AND IT IS BELIEVED THAT A NEAR-SUMMIT PLUME STILL EXISTS BUT IS EMBEDDED WITHIN THE CLOUDINESS ASSOCIATED WITH THE SHOWERS AND THUNDERSTORMS. ASH AND STEAM IS BELIEVED TO BE LIGHT IN CONCENTRATION AND REACHING FL200. . TRAJECTORY: WEST-SOUTHWEST 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 . 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 14/0730 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN