FVXX20 KWBC 280900 . VOLCANIC ASH ADVISORY STATEMENT CORRECTION TO NEXT MESSAGE TIME ISSUED 0900 UTC 28 NOV 1999 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 99-121 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 INFRARED AND MULTISPECTRAL IMAGERY...00 UTC AVIATION MODEL WIND FORECAST . ERUPTION DETAILS: NEW ERUPTION BEGINNING AT 28/0215 UTC. . DETAILS OF ASH CLOUD: IN SATELLITE IMAGERY ASH FROM THE 0215 UTC ERUPTION RAPIDLY BECAME FAINTER AS IT MOVED TO THE SOUTHWEST. IN THE MOST RECENT IMAGES THROUGH 0815 UTC ASH CAN NO LONGER BE DISCERNED AGAINST THE BACKGROUND OF LOW AND SOME MID LEVEL WEATHER CLOUDS. UPPER AIR PATTERNS SUGGEST THAT ANY DIFFUSE REMAINING ASH WILL BE SOUTHWEST OF THE SUMMIT BUT PROBABLY STILL ONSHORE. ANY REMAINING ASH SHOULD SOON REACH THE PACIFIC AND SHOULD BE BELOW FL420. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN FL150 AND FL420 WOULD MOVE TO THE SOUTHWEST AT LESS THAN 25 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 BY 28/1500 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN