FVXX20 KWBC 181045 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1045 UTC 18 OCTOBER 1999 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 99-052 ECUADOR 0.17S 78.60W . BACKGROUND: GUAGUA PICHINCHA (1502-02) SUMMIT HEIGHT 15,695 FT (4784 M) . SOURCES OF INFORMATION:GEOPHYSICAL INSTITUTE IN QUITO...INFRARED AND MULTISPECTRAL GOES 8 SATELLITE IMAGERY . ERUPTION DETAILS: EXPLOSIVE ERUPTION OCCURRED AT 18/0321 UTC. . DETAILS OF ASH CLOUD: THE ASH PLUME SEEN EARLIER IN SATELLITE IMAGERY DISSIPATED BY 0545 UTC. SATELLITE IMAGERY THROUGH 1015 UTC REVEALED EXTENSIVE HIGH AND MID LEVEL CLOUDS BUT NO INDICATION OF ASH. THE GEOPHYSICAL INSTITUTE REPORTED THAT THERE HAS BEEN NO FURTHER ACTIVITY AT GUAGUA SINCE 0500 UTC. . TRAJECTORY: N/A . 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 www.ssd.noaa.gov/VAAC/washington.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS AND VAFTAD. . THIS WILL BE THE FINAL WARNING ISSUED ON THIS EVENT. WATCH STATEMENTS WILL RESUME AT 19/1500 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN