FVXX21 KWBC 071515 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1515 UTC 07 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-217 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 MULTISPECTRAL AND INFRARED IMAGERY. UPPER AIR DATA AND REPORTS FROM THE GEOPHYSICAL INSTITUTE. U.S. NATIONAL WEATHER SERVICE MODEL DATA. . ERUPTION DETAILS: CONTINUOUS EMISSION OF ASH AND STEAM. . DETAILS OF ASH: INFORMATION RECEIVED FROM THE GEOPHYSICAL INSTITUTE INDICATES THAT AN EXPLOSION OCCURRED AT 1425 UTC. CURRENT SATELLITE IMAGERY THROUGH 1445 UTC SHOWS NO DETECTABLE ASH PLUME. HOWEVER THE AREA IS COVERED WITH THUNDERSTORM AND CIRRUS DEBRIS. THERE IS NO ESTIMATE AVAILABLE FOR THE CURRENT PLUME HEIGHT. . TRAJECTORY: ASH IS ESTIMATED BELOW FL150 MOVING N. . 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 AND VAFTAD. . 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 07/2130 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN