FVXX20 KWBC 110520 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0520 UTC 11 DEC 1999 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 99-148 ECUADOR 0.17S 78.60W . BACKGROUND: GUAGUA PICHINCHA ECUADOR (1502-02) SUMMIT HEIGHT 15695 FT (4784 M) . SOURCES OF INFORMATION: THE GEOPHYSICAL INSTITUTE IN ECUADOR. GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. U.S. NUMERICAL MODEL WIND FORECAST. . ERUPTION DETAILS: SIGNIFICANT ERUPTION OCCURRED AT 10/2213 UTC. . DETAILS OF ASH CLOUD: THE ASH CLOUD FROM THE 10/2213 UTC ERUPTION IS NO LONGER DETECTABLE IN SATELLITE IMAGERY. SATELLITE IMAGERY THROUGH 0445 UTC INDICATED MID AND HIGH LEVEL CLOUD IN THE VICINITY OF THE VOLCANO WITH NO EVIDENCE OF ASH. THE GEOPHYSICAL INSTITUTE EXPECTS A CONTINUATION OF DOME GROWTH WITH SUBSEQUENT COLLAPSES OCCURRING WITHOUT WARNING. . TRAJECTORY: ANY REMAINING ASH WOULD TO FL450 WOULD MOVE TOWARDS THE SOUTHWEST BETWEEN 15 AND 20 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 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 11/1100 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . TURK . NNNN