FVXX21 KWBC 212000 VOLCANIC ASH ADVISORY . ISSUED: 2001DEC21/2000Z VAAC: WASHINGTON . VOLCANO: POPOCATEPETL 1401-09 LOCATION: 1901N 9837W AREA: MEXICO . SUMMIT ELEVATION: 17930 FT (5465 M) . ADVISORY NUMBER: 2001/117 INFORMATION SOURCE: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL IMAGERY. MEXICO CITY METEOROLOGICAL WATCH OFFICE. CENAPRED. SIX HOUR WIND FORECAST FROM THE 21/1200Z AVIATION MODEL. . ERUPTION DETAILS: VENTING OF STEAM AND ASH AT 21/1235Z. . DETAILS OF ASH CLOUD: ASH IS NOT SEEN IN THE SATELLITE IMAGERY THROUGH 21/1945Z..HOWEVER A BRIGHT HOT SPOT IS VISIBLE IN SHORTWAVE IMAGERY. . TRAJECTORY: ANY ASH AT FL230 WILL MOVE TO THE NORTHEAST AT 25 KNOTS. . OUTLOOK: SEE SIGMETS. . NEXT ADVISORY: WILL BE ISSUED BY 2001DEC22/0200Z . WALTER . NNNN