FVXX21 KWBC 190900 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0900 UTC 19 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-266 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY...19/0600 UTC AVIATION MODEL WIND FORECAST... . ERUPTION DETAILS: OCCASIONAL EMISSIONS OF ASH AND STEAM... . DETAILS OF ASH: THE GOES-8 IMAGERY THRU 19/0815 UTC DOES NOT INDICATE ANY ASH OVER OR ADJACENT TO THE TUNGURAHUA VOLCANO. HOWEVER CAUTION IS STRONGLY SUGGESTED AS THEIR HAVE BEEN EMISSIONS OF ASH AND STEAM OCCURRING REPEATEDLY OVER THE LAST WEEK WITH LITTLE OR NO WARNING. THERE WERE SOME OF THESE EMISSIONS EARLIER TODAY WITH A HEIGHT OF FL180 ESTIMATED. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ASH AT FL180 WOULD MOVE TO THE WEST-SOUTHWEST AT ABOUT 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 19/1500 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN