FVXX20 KWBC 291700 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1700 UTC 29 NOV 1999 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 99-126 ECUADOR 0.17S 78.60W . BACKGROUND: GUAGUA PICHINCHA ECUADOR (1502-02) SUMMIT HEIGHT 15695 FT (4784 M) . SOURCES OF INFORMATION: THE GEOFISICO INSTITUTO IN ECUADOR REPORTS AN EXPLOSIVE ERUPTION OF GUAGUA AT 1640 UTC. . ERUPTION DETAILS: ERUPTION AT 29/1640 UTC.. . DETAILS OF ASH CLOUD: THE INSTITUTE REPORTED AN ERUPTION AT 1640 UTC BUT THE HEIGHT IS UNKNOWN. WE DO NOT SEE ANYTHING IN SATELLITE IMAGERY YET SINCE THE ERUPTION JUST OCCURRED. WE WILL SEND ANOTHER MESSAGE WITH MORE DETAILS AS SOON AS POSSIBLE. . TRAJECTORY: ACCORDING TO UPPER AIR PATTERNS ANY VOLCANIC ASH FROM FL150 TO FL300 WILL MOVE TOWARDS THE WEST AT 15 KTS. . 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 . THE NEXT STATEMENT WILL BE ISSUED AS SOON AS POSSIBLE. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . KARST . NNNN