FVXX21 KWBC 072120 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2120 UTC 07 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-218 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE MULTISPECTRAL AND INFRARED IMAGERY. UPPER AIR DATA AND REPORTS FROM THE GEOPHYSICAL INSTITUTE. U.S. NATIONAL WEATHER SERVICE MODEL DATA. . ERUPTION DETAILS: CONTINUOUS EMISSION OF ASH AND STEAM. . DETAILS OF ASH: CURRENT SATELLITE IMAGERY THROUGH 2015 UTC SHOWS NO DETECTABLE ASH PLUME. THE AREA IS COVERED WITH THUNDERSTORM DEBRIS AND CIRRUS. . TRAJECTORY: MODEL DATA FORECASTS INDICATE THAT ANY ASH BETWEEN FL190 AND FL320 WOULD MOVE NORTHWESTERLY AT 15 TO 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 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 08/0330 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN