FVXX20 KWBC 281500 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1500 UTC 28 NOV 1999 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 99-122 ECUADOR 0.17S 78.60W . BACKGROUND: GUAGUA PICHINCHA ECUADOR (1502-02) SUMMIT HEIGHT 15695 FT (4784 M) . SOURCES OF INFORMATION: REPORT FROM THE GEOFISICO INSTITUTO IN ECUADOR...GOES-8 VISIBLE AND INFRARED AND MULTISPECTRAL IMAGERY...00 UTC AVIATION MODEL WIND FORECAST . ERUPTION DETAILS: LATEST ERUPTION AT 28/0215 UTC. . DETAILS OF ASH CLOUD: LOW AND MID LEVEL CLOUDINESS COVER THE REGION AROUND THE VOLCANO MAKING IT DIFFICULT TO SEE ANY ASH THRU 1415 UTC SATELLITE IMAGERY. UPPER AIR PATTERNS SUGGEST THAT ANY ASH REMAINING WILL BE SOUTHWEST OF THE SUMMIT. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN FL150 AND FL420 WOULD MOVE TO THE SOUTHWEST AT 15 TO 20 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 http://www.ssd.noaa.gov/VAAC/washington.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 28/2100 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN