FVXX20 KWBC 122110 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2110 UTC 12 OCTOBER 1999 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 99-044 ECUADOR 0.17S 78.60W . BACKGROUND: GUAGUA PICHINCHA (1502-02) SUMMIT HEIGHT 15,695 FT (4784 M) . SOURCES OF INFORMATION:...GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: THE GEOPHYSICAL INSTITUTE REPORTS AN EXPLOSIVE ERUPTION OF GUAGUA AT 12/1958 UTC. . DETAILS OF ASH CLOUD:DENSE METEOROLOGICAL CLOUDS COVER THE AREA AROUND THE VOLCANO MAKING IT DIFFICULT TO SEE ANY ASH THRU 12/2045 UTC. . TRAJECTORY:ACCORDING TO UPPER AIR FORECASTS ANY ASH UP TO FL400 WOULD MOVE TO THE WEST AT 25 TO 30 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 . THE NEXT MESSAGE WILL BE ISSUED AT 13/0310 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN