FVXX21 KWBC 172040 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2040 UTC 17 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-260 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...17/1200 UTC AVIATION MODEL WIND FORECAST...GEOPHYSICAL INSTITUTE REPORT AND UPPER AIR DATA. . ERUPTION DETAILS: NEW PUFF AT 17/0100 UTC. . DETAILS OF ASH: THE LATEST GOES-8 IMAGE AT 1945 UTC SHOWED WEATHER CLOUDS OVER THE VOLCANO THAT HINDERED THE DETECTION OF ASH. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BELOW FL240 WOULD MOVE TO THE 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 18/0230 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . BROWN/NOAA/NESDIS/SAB . NNNN