FVXX21 KWBC 221500 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1500 UTC 22 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-279 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED VISIBLE AND MULTISPECTRAL IMAGERY. GEOPHYSICAL INSTITUTE REPORT AND AVIATION MODEL WIND DATA. . ERUPTION DETAILS: CONTINUAL STEAM AND ASH EMISSION. . DETAILS OF ASH: THERE IS EXTENSIVE METEOROLOGICAL CLOUD COVER IN THE AREA THROUGH 1415 UTC MAKING DETECTION OF ANY ASH DIFFICULT. ANY ASH PRESENT IS BELIEVED TO BE BELOW FL230 BASED ON YESTERDAYS DAILY REPORT FROM THE GEOPHYSICAL INSTITUTE WHICH INDICATED ASH HEIGHTS NO GREATER THAN FL230. . TRAJECTORY: ANY ASH BETWEEN FL165 AND FL230 WOULD MOVE TOWARD THE 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 22/2100 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . CLARK/SAB/NOAA/NESDIS . NNNN