FVXX20 KWBC 040800 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0800 UTC 04 JAN 1999 BY THE WASHINGTON VAAC GUAGUA PICHINCHA 99-003 ECUADOR 0.17S 78.6W . BACKGROUND: GUAGUA PICHINCHA (NEAR QUITO) (1502-02) SUMMIT HEIGHT 15696 FT (4784M) . SOURCES OF INFORMATION: SIGMET FROM GUAYAQUIL (SEGU)...GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. . ERUPTION DETAILS: EXPLOSIVE FREATIC ERUPTION WITH ASH AND WATER VAPOR PRODUCED. . DETAILS OF ASH CLOUD: A SIGMET REPORTS A NEW ERUPTION OF THE VOLCANO AT 04/0531 UTC AND INDICATES THAT THERE IS ASH. DUE TO DENSE METEOROLOGICAL CLOUDS ASH CANNOT BE OBSERVED IN SATELLITE IMAGERY THROUGH 0715 UTC AND THE HEIGHT OF THE ASH CANNOT BE DETERMINED. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN FL200 AND FL250 WOULD MOVE WEST OR WEST SOUTHWEST AT 10 TO 20 KNOTS. . 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/messages.html (all lower case except /VAAC/) . OUTLOOK: SEE LATEST SIGMETS AND VAFTAD. . THE NEXT MESSAGE WILL BE ISSUED BY 04/1400 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN