FVXX21 KWBC 291245 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1245 UTC 29 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-309 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...GEOPHYSICAL INSTITUTE IN QUITO...UPPER-AIR SOUNDING DATA... . ERUPTION DETAILS: INTERMITTENT ASH AND STEAM EMISSIONS... . DETAILS OF ASH: MORNING SATELLITE DATA THRU 29/1215 UTC DOES NOT INDICATE ANY ASH OR STEAM IN THE VICINITY OF THE SUMMIT. A LAYER OF MID AND HIGH LEVEL CLOUDS ASSOCIATED WITH NEARBY SHOWER AND THUNDERSTORM ACTIVITY IS NOTED. HOWEVER THE GEOPHYSICAL INSTITUTE REPORTS THAT THERE CONTINUE TO BE SMALL EXPLOSIONS ON A DAILY BASIS WITH ASH AND STEAM EMITTED. THE EMISSIONS HAVE BEEN BEEN REPORTED TO BE RATHER WEAK AND GENERALLY REACHING FL200. . TRAJECTORY: ANY ASH AND STEAM FROM THE SUMMIT TO FL200 SHOULD MOVE MOVE TO THE SOUTHEAST 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. . 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 29/1900 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN