FVXX21 KWBC 240130 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0130 UTC 24 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-286 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...GEOPHYSICAL INSTITUTE REPORT...1800 UTC AVIATION MODEL WIND FORECAST...1700 UTC SURFACE OBSERVATION FROM LATACUNGA . ERUPTION DETAILS: INTERMITTENT ASH AND STEAM EMISSIONS . DETAILS OF ASH: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 0045 UTC DUE TO THE DENSE WEATHER CLOUDS IN THE AREA. AT 23/1700 UTC A SURFACE OBSERVATION FROM LATACUNGA REPORTED VOLCANIC ASH OVER THE VOLCANO AND MOVING TO THE WEST SOUTHWEST. THE GEOPHYSICAL INSTITUTE REPORTS THAT ON THE MORNING OF DECEMBER 23 ASH AND STEAM EMISSIONS UP TO ABOUT FL300 WERE OBSERVED. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN FL220 AND FL300 WILL MOVE TOWARD THE SOUTH AT ABOUT 10 KNOTS. ASH BETWEEN FL160 AND FL200 WILL MOVE TOWARD THE WEST OR WEST NORTHWEST AT ABOUT 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 24/0730 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN