FVXX20 KWBC 051945 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1945 UTC 05 OCTOBER 1999 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 99-025 ECUADOR 0.17S 78.60W . BACKGROUND: GUAGUA PICHINCHA (1502-02) SUMMIT HEIGHT 15,695FT (4784 M) . SOURCES OF INFORMATION: USGS SURVEY TEAM AT THE GUAGUA VOLCANO...GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. . ERUPTION DETAILS:ERUPTION OCCURRED AROUND 05/1915 UTC TO FL500. DETAILS OF ASH CLOUD: THE USGS HAS REPORTED A MAJOR VOLCANIC EXPLOSION AT THE GUAGUA PICHINCHA VOLCANO. SATELLITE IMAGERY THROUGH 1915 UTC INDICATES AN IMPRESSIVE ASH CLOUD LEAVING THE VOLCANO. THE ASH CLOUD IS THICK AND CAN BE SEEN IN EVERY CHANNEL OF SATELLITE IMAGERY. INITIAL SATELLITE ASSESSMENTS INDICATE THAT THE ASH CLOUD IS REACHING FL500. THE MOVEMENT OF ASH IS HARD TO ASSESS RIGHT NOW SINCE THE ERUPTION HAS JUST OCCURRED AND IS POSSIBLY STILL OCCURRING. . TRAJECTORY: ASH UP TO FL400 SHOULD MOVE TO THE WEST AT 20 TO 30 KNOTS WHILE ASH ABOVE FL400 SHOULD MOVE NORTHEAST OR EAST AT 15 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 www.ssd.noaa.gov/VAAC/washington.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS AND VAFTAD. . ANOTHER STATEMENT WITH A GRAPHIC OF THE ASH CLOUD WITHIN THE NEXT HOUR AS MORE INFORMATION BECOMES AVAILABLE. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN