FVXX20 KWBC 202300 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2300 UTC 20 SEPTEMBER 1999 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 99-014 ECUADOR 0.17S 78.60W . BACKGROUND: GUAGUA PICHINCHA (1502-02) SUMMIT HEIGHT 15,695FT (4784 M) . SOURCES OF INFORMATION: SIGMET FROM GUAYAQUIL MWO. GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. ERUPTION DETAILS: ERUPTION AT APPROXIMATELY 20/0955 UTC. . DETAILS OF ASH CLOUD: GOES 8 SATELLITE IMAGERY AT 2045 UTC DOES NOT DETECT ANY FURTHER ACTIVITY AT THE VOLCANO. THE GEOPHYSICAL INSTITUTE REPORTED A PHREATIC EXPLOSION OF 2KM HIGH, TO FL 200, CONTINING VAPOR BUT NO ASH AT 1426 UTC. . TRAJECTORY: THE 20/0000 UTC AVIATION MODEL SUGGEST ANY ASH BELOW FL300 WOULD MOVE TOWARDS THE WEST AT 15-25 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 www.ssd.noaa.gov/VAAC/washington.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS. . THIS WILL BE THE LAST MESSGE FOR THIS EVENT. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN