FVXX20 KWBC 152300 VOLCANIC ASH ADVISORY ISSUED: 2001DEC15/2300Z VAAC: WASHINGTON . VOLCANO: SOUFRIERE HILLS 1600-05 LOCATION: 1643N 6211W AREA: CARIBBEAN . SUMMIT ELEVATION: 3000 FT (915 M) . ADVISORY NUMBER: 2001/280 . INFORMATION SOURCE: GOES-8 VISIBLE AND INFRARED AND MULTISPECTRAL IMAGERY. MONTSERRAT VOLCANO OBSERVATORY. 12Z GUADELOUPE UPPER AIR SOUNDING. . ERUPTION DETAILS: LATEST EMISSION AT 15/1230Z. . DETAILS OF ASH CLOUD: THE MONTSERRAT VOLCANO OBSERVATORY REPORTED AN EMISSION OF ASH TO UNKNOWN ALTITUDE AT APPROXIMATELY 15/1230Z. EXTENSIVE CLOUDS IN THE AREA MAKE IT DIFFICULT TO ESTIMATE AN ALTITUDE OF THE ASH CLOUD BUT RECENT EMISSIONS HAVE BEEN AT OR BELOW FL060. . TRAJECTORY: ASH BETWEEN FL030 AND FL060 WOULD MOVE WEST AT 25 TO 30 KNOTS. . OUTLOOK: SEE SIGMETS. . NEXT ADVISORY: WILL BE ISSUED BY 2001DEC16/0500Z. . . NNNN