FVXX21 KWBC 060400 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0400 UTC 06 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-211 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. UPPER AIR DATA AND DAILY REPORT FOR 05 DECEMBER FROM THE GEOPHYSICAL INSTITUTE. U.S. NATIONAL WEATHER SERVICE MODEL DATA. . ERUPTION DETAILS: CONTINUOUS EMISSION OF ASH AND STEAM. . DETAILS OF ASH: NO ASH HAS BEEN OBSERVED SINCE EARLIER TODAY BUT THERE IS EXTENSIVE METEOROLOGICAL CLOUDS IN THE AREA. TRAJECTORY: ANY ASH AT FL350 WOULD MOVE TOWARD TOWARDS THE SOUTH SOUTHWEST AT 15 TO 20 KNOTS. ANY ASH AT FL250 WOULD MOVE TOWARDS THE SOUTHWEST AT 5 TO 10 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 06/1000 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. NNNN