FVXX20 KWBC 110900 VOLCANIC ASH ADVISORY ISSUED: 2001DEC11/0900Z VAAC: WASHINGTON . VOLCANO: POPOCATEPETL 1401-09 LOCATION: 1901N 9837W AREA: MEXICO . SUMMIT ELEVATION: 17930 FT (5465 M) . ADVISORY NUMBER: 2001/105 . INFORMATION SOURCE: SIGMET FROM THE MEXICO CITY METEOROLOGICAL WATCH OFFICE. GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. SIX HOUR WIND FORECAST FROM THE 11/00Z AVIATION MODEL. . ERUPTION DETAILS: ASH OBSERVED OVER THE VOLCANO AT 11/0158Z. . DETAILS OF ASH CLOUD: ASH IS NOT SEEN IN THE SATELLITE IMAGERY THROUGH 11/0832Z. HOWEVER A VERY BRIGHT HOTSPOT CONTINUES TO BE OBSERVED IN THE SHORTWAVE IMAGERY. . TRAJECTORY: ANY REMAINING ASH FROM THE SUMMIT TO FL210 WILL MOVE TO THE NORTHEAST AT 20 TO 30 KNOTS. . OUTLOOK: SEE SIGMETS. . NEXT ADVISORY: WILL BE ISSUED BY 2001DEC11/1500Z . WALTER . NNNN