FVXX20 KWBC 211455 VOLCANIC ASH ADVISORY . ISSUED: 2001DEC21/1455Z VAAC: WASHINGTON . VOLCANO: SOUFRIERE HILLS 1600-05 LOCATION: 1643N 6211W AREA: CARIBBEAN . SUMMIT ELEVATION: 3000 FT (915 M) . ADVISORY NUMBER: 2001/283 . INFORMATION SOURCE: MONTSERRAT VOLCANO OBSERVATORY, VISIBLE ... INFRARED AND MULTISPECTRAL IMAGERY. SIX HOUR AVIATION FORECAST MODEL . ERUPTION DETAILS: VENTING OF ASH AROUND 21/1310Z . DETAILS OF ASH CLOUD: SATELLITE IMAGERY THROUGH 1432Z SHOWS THE VOLCANO AND SURROUNDING AREA OBSCURED BY CLOUDS. THERE HAS BEEN NO INDICATION OF HOT SPOT ACTIVITY IN THE IMAGERY. . TRAJECTORY: ASH UP TO FL080 WILL MOVE WESTERLY AT 10 TO 15 KNOTS. . OUTLOOK: SEE SIGMETS. . NEXT ADVISORY: WILL BE ISSUED BY 2001DEC21/2100Z. . . NNNN