FVXX21 KWBC 291138 VOLCANIC ASH ADVISORY . ISSUED: 2001DEC29/1138Z VAAC: WASHINGTON . VOLCANO: POPOCATEPETL 1401-09 LOCATION: 1901N 9837W AREA: MEXICO . SUMMIT ELEVATION: 17930 FT (5465 M) . ADVISORY NUMBER: 2001/128 INFORMATION SOURCE: SIGMET FROM MEXICO CITY METEOROLOGICAL WATCH OFFICE. GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. SIX HOUR FORECAST FROM 29/0600Z AVIATION MODEL. . ERUPTION DETAILS: ASH OBSERVED AT 29/1032Z. . DETAILS OF ASH CLOUD: A SIGMET INDICATED THAT ASH WAS OBSERVED WITHIN 5 NMI OF THE SUMMIT BETWEEN FL180 AND FL290. SATELLITE IMAGERY THROUGH 29/1102Z SHOWS THE AREA AROUND THE VOLCANO OBSCURED BY CLOUDS. . TRAJECTORY: ASH BETWEEN FL180 AND FL290 WOULD MOVE EAST NORTHEAST AT AROUND 30 KNOTS. . OUTLOOK: SEE SIGMETS. . NEXT ADVISORY: WILL BE ISSUED BY 2001DEC29/1730Z. . . NNNN