FVXX21 KWBC 100025 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0025 UTC 10 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-227 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 MULTISPECTRAL AND VISIBLE IMAGERY...GUAYAQUIL MWO...UPPER AIR DATA AND REPORTS FROM THE GEOPHYSICAL INSTITUTE...SURFACE OBSERVATIONS . ERUPTION DETAILS: CONTINUOUS EMISSION OF ASH AND STEAM....ASH REPORTED TO BE REACHING HIGHER ALTITUDES . DETAILS OF ASH: VISIBLE AND MULTISPECTRAL SATELLITE IMAGERY THROUGH 09/2345 UTC CONTINUES SHOW AN ASH CLOUD LEAVING THE SUMMIT AND PUSHING TO THE SOUTHWEST. THE ASH CLOUD IS BECOMING HEAVILY OBSCURED THOUGH BY CLOUD DEBRIS FROM NEARBY SHOWER AND THUNDERSTORM ACTIVITY WHICH IS MAKING IT VERY DIFFICULT TO ANALYZE. HOWEVER THE GEOPHYSICAL INSTITUTE IS NOW REPORTING THAT ASH IS REACHING AS HIGH AS FL310. ASH IS BEING REPORTED AT THE SURFACE WHICH FURTHER CONFIRMS THE ACTIVITY. ASH CURRENTLY EXTENDS OVER 100 KM (54 NMI) TO THE SOUTHWEST OF THE SUMMIT. . TRAJECTORY: SOUTHWEST AT 10 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 10/0630 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN