FVXX21 KWBC 281130 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1130 UTC 28 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-304 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. INSTITUTE GEOFISICO REPORT AND 12 HOUR FORECAST WIND DATA FROM THE 28/0000 UTC AVIATION MODEL. . ERUPTION DETAILS: EMISSIONS OF ASH AND STEAM . DETAILS OF ASH: SATELLITE IMAGERY THRU 28/1045 UTC DOES NOT SHOW ANY ASH IN THE VICINITY OF THE VOLCANO. SCATTERED MIDDLE LAYER CLOUDS AROUND THE VOLCANO ARE MAKING IT DIFFICULT TO SEE ANY POSSIBLE ASH PLUME. . TRAJECTORY: ANY ASH BELOW FL180 WOULD MOVE TOWARDS THE SOUTH AT 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 28/1730 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN