FVXX21 KWBC 131330 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1330 UTC 13 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-242 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. . ERUPTION DETAILS: CONTINUOUS EMISSION OF ASH AND STEAM. . DETAILS OF ASH: NO ASH CAN BE DETECTED IN IMAGERY THROUGH 1245 UTC ALTHOUGH THERE IS EXTENSIVE METEOROLOGICAL CLOUDINESS IN THE AREA. THE VOLCANO REMAINS IN A VERY RESTLESS STATE WITH POSSIBLE EXPLOSIVE ERUPTIONS AT ANYTIME. . TRAJECTORY: UPPER AIR WIND FORECASTS FROM NUMERICAL MODELS SUGGEST ANY ASH UP AROUND FL320 WOULD MOVE TOWARD THE NORTH AT 5-10 KNOTS. ANY ASH AROUND FL250 WOULD MOVE TOWARD THE NORTHWEST AT 5-10 KNOTS. ANY ASH AT OR BELOW FL200 WOULD MOVE TOWARD THE WEST AT 5-10 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 13/1930 UTC. . . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN