FVXX20 KWBC 101435 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1435 UTC 10 NOV 1999 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 99-079 ECUADOR 0.17S 78.60W . BACKGROUND: GUAGUA PICHINCHA ECUADOR (1502-02) SUMMIT HEIGHT 15695 FT (4784 M) . SOURCES OF INFORMATION: GEOPHYSICAL INSTITUTE IN QUITO...VISIBLE INFRARED AND MULTISPECTRAL GOES-8 SATELLITE IMAGERY...00 UTC UPPER AIR DATA FROM GUAGUA PICHINCHA...13 UTC SURFACE REPORT FROM QUITO/MARISCAL . ERUPTION DETAILS: REPORTED MINOR EXPLOSIVE ERUPTIONS AT 10/0643 AND 10/1151 UTC. . DETAILS OF ASH CLOUD: NO ASH IS VISIBLE IN SATELLITE IMAGERY THROUGH 10/1415 UTC. HOWEVER THERE ARE METEOROLOGICAL CLOUDS IN THE AREA WHICH MIGHT BE OBSCURING ASH. THE 13Z METAR FROM QUITO/MARISCAL REPORTED REPORTS EXPLOSIONS OF GAS AND VOLCANIC ASH MOVING NORTHEAST OF THE STATION. THE GEOPHYSICAL INSTITUTE REPORTED ASH FALLS LIGHT ASH IN NORTHERN QUITO. ASH IS REPORTED AT APPROXIMATELY FL250. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN AROUND FL250 WOULD MOVE TOWARD THE EAST AT ABOUT 5 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 http://www.ssd.noaa.gov/VAAC/washington.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS . THE NEXT STATEMENT WILL BE ISSUED BY 10/2030 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN