FVXX21 KWBC 231240 VOLCANIC ASH ADVISORY ISSUED: 2002OCT23/1240Z VAAC: WASHINGTON . VOLCANO: SOUFRIERE HILLS 1600-05 LOCATION: N1643W06211 AREA: MONTSERRAT . SUMMIT ELEVATION: 3000 FT (915 M) . ADVISORY NUMBER: 2002/170 . INFORMATION SOURCE: GOES-8 IMAGERY. GFS MODEL WINDS FORECAST. MONTSERRAT VOLCANO OBSERVATORY . ERUPTION DETAILS: ONGOING ASH VENTING. . OBS ASH DATE/TIME: 23/1215Z. . OBS ASH CLOUD: SFC/FL080 10 NMI WIDE LINE OF ASH EXTENDING BETWEEN N1643W06211 N1649W06248. ASH IS MOVING WEST AT 10 TO 15 KNOTS. . FCST ASH CLOUD+6H: SEE SIGMETS. . REMARKS: PLUME IS 35 NMI LONG AND IS ESTIMATED AT FL080. . NEXT ADVISORY: WILL BE ISSUED BY 2002OCT23/1900Z. . NNNN