FVXX20 KWBC 061400 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1400 UTC 06 OCTOBER 1999 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 99-030 ECUADOR 0.17S 78.60W . BACKGROUND: GUAGUA PICHINCHA (1502-02) SUMMIT HEIGHT 15,695FT (4784 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY THROUGH 1345 UTC...QUITO SURFACE OBSERVATIONS...VAFTAD AND AN EXPERIMENTAL ASH TRAJECTORY MODEL. . ERUPTION DETAILS: ERUPTION OCCURRED AROUND 05/1915 UTC. DETAILS OF ASH CLOUD: DENSE METEOROLOGICAL CLOUDS STILL COVER MOST OF ECUADOR. DUE TO THESE CLOUDS EARLY MORNING VISIBLE DATA IN THE VICINITY OF THE VOLCANO DOES NOT INDICATE ASH. HOWEVER SURFACE OBSERVATIONS FROM QUITO STILL REPORTED VOLCANIC ASH OVER THE STATION AT THE 1000 UTC REPORT. THE VAFTAD DISPERSION MODEL INDICATED THAT ANY ASH UP TO FL380 WOULD MOVE TO THE WEST OR SOUTHWESTWARD TOWARDS THE EAST PACIFIC OCEAN. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ASH AT ABOUT FL380 WILL MOVE TOWARD THE WEST OR SOUTHWESTWARD AT ABOUT 20 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. . THE NEXT STATEMENT WILL BE ISSUED BY 06/2030 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN