FVXX20 KWBC 280235 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0235 UTC 28 NOV 1999 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 99-119 ECUADOR 0.17S 78.60W . BACKGROUND: GUAGUA PICHINCHA ECUADOR (1502-02) SUMMIT HEIGHT 15695 FT (4784 M) . SOURCES OF INFORMATION: REPORT FROM THE GEOFISCO INSTITUTO IN ECUADOR . ERUPTION DETAILS: NEW ERUPTION BEGINNING AT 28/0215 UTC. . DETAILS OF ASH CLOUD: THE GEOFISCO INSTITUTO IN ECUADOR HAS REPORTED THAT AN ERUPTION HAS OCCURRED JUST RECENTLY AT THE GUAGUA PICHINCHA VOLCANO. PRELIMINARY REPORTS INDICATE THAT IT IS NOT AS INTENSE AS THE ONE TWO NIGHTS BUT THAT IT WAS AT LEAST A MODERATE ERUPTION. . SATELLITE IMAGERY OVER THE NEXT 30 MINUTES WILL BE ABLE TO CONFIRM THE NATURE OF THE ASH PLUME INCLUDING A HEIGHT ASSESSMENT. . TRAJECTORY: LATEST UPPER-AIR SOUNDING DATA INDICATES NORTHEASTERLY WINDS OVER A DEEP LAYER OF THE ATMOSPHERE. IF ASH IS PRESENT ANYWHERE FROM THE SUMMIT TO ABOUT FL500 THE MOVEMENT WOULD BE SOUTHWEST AT 10 TO 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 http://www.ssd.noaa.gov/VAAC/washington.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED AS SOON AS SATELLITE IMAGERY CONFIRMS THE NATURE OF THE EVENT. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN