FVXX20 KWBC 211330 VOLCANIC ASH ADVISORY ISSUED: 2001DEC21/1330Z VAAC: WASHINGTON . VOLCANO: SOUFRIERE HILLS 1600-05 LOCATION: 1643N 6211W AREA: CARIBBEAN . SUMMIT ELEVATION: 3000 FT (915 M) . ADVISORY NUMBER: 2001/281 . INFORMATION SOURCE: MONTSERRAT VOLCANO OBSERVATORY, INFRARED AND MULTISPECTRAL IMAGERY. SIX HOUR AVIATION FORECAST MODEL . ERUPTION DETAILS: VENTING OF ASH AROUND 21/1310Z . DETAILS OF ASH CLOUD: THE MONTSERRAT VOLCANO OBSERVATORY REPORTED AN ASH PLUME OVER THE VOLCANO UP TO FL080 AND MOVING WEST. SATELLITE IMAGERY IS NOT YET AVAILABLE FOR THE TIME OF THE EVENT. . TRAJECTORY: ASH UP TO FL080 WILL MOVE WESTERLY AT 10 TO 15 KNOTS. . OUTLOOK: SEE SIGMETS. . NEXT ADVISORY: WILL BE ISSUED BY 2001DEC21/1500Z. . . NNNN