FVXX21 KWBC 221830 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1830 UTC 22 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-280 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: CLOUDS BEGAN TO BREAK IN THE IMMEDIATE VICINITY OF THE SUMMIT BY 1845 UTC. THERE WAS NO DISCERNIBLE ASH SIGNATURE IN VISIBLE OR MULTISPECTRAL IMAGERY...HOWEVER THE POSSIBILITY OF LOW LEVEL ACTIVITY EXISTS 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 SOUTHWEST 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. . 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 23/0130 UTC OR SOONER IF ADDITIONAL INFORMATION BECOMES AVAILABLE. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . TURK/SAB/NOAA/NESDIS . NNNN