FVXX21 KWBC 141930 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1930 UTC 14 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-247 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY...U.S. NUMERICAL MODEL WIND FORECASTS...GEOPHYSICAL INSTITUTE REPORT AND WIND DATA . ERUPTION DETAILS: CONTINUOUS VENTING OF LIGHT ASH AND STEAM...OCCASIONAL WEAK TO MODERATE EXPLOSIONS WITH THICKER ASH . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 1845 UTC SHOWS BROKEN CLOUDS IN THE VICINITY OF THE VOLCANO. NO ASH PLUME IS CURRENTLY BEING DETECTED ON ANY CHANNEL OR IN VISIBLE IMAGERY. . TRAJECTORY: ANY ASH BELOW FL240 WOULD MOVE GENERALLY TOWARD THE WEST AT ABOUT 20 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 15/0130 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN