FVXX20 KWBC 110310 VOLCANIC ASH ADVISORY ISSUED: 2001DEC11/0310Z VAAC: WASHINGTON . VOLCANO: POPOCATEPETL 1401-09 LOCATION: 1901N 9837W AREA: MEXICO . SUMMIT ELEVATION: 17930 FT (5465 M) . ADVISORY NUMBER: 2001/104 . INFORMATION SOURCE: SIGMET FROM THE MEXICO CITY METEOROLOGICAL WATCH OFFICE..GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. MEXICO CITY 00Z SOUNDING. . ERUPTION DETAILS: ASH OVER THE VOLCANO OBSERVED AT 11/0158Z. . DETAILS OF ASH CLOUD: ASH WAS OBSERVED OVER THE VOLCANO AT 0158Z EXTENDING 5NM ENE OF THE VOLCANO BETWEEN FL170 TO FL200. NO ASH CAN BE DETECTED IN SATELLITE IMAGERY. HOTSPOT ACTIVITY BEGAN ABOUT 0115Z AND HAS CONTINUED THROUGH THE CURRENT 0245Z IMAGE. THE VOLCANO IS OBSCURED BY THIN HIGH CLOUDS. . TRAJECTORY: UPPER AIR PATTERNS SUGGESTS THAT ANY ASH BETWEEN THE SUMMIT AND FL210 WOULD MOVE TO THE EAST NORTHEAST AT ABOUT 25 KNOTS. . OUTLOOK: SEE SIGMETS. . NEXT ADVISORY: WILL BE ISSUED BY 2001DEC11/0900Z . NNNN