FVXX21 KWBC 131800 VOLCANIC ASH ADVISORY ISSUED: 2002MAR08/1800Z VAAC: WASHINGTON . VOLCANO: SOUFRIERE HILLS 1600-05 LOCATION: 1643N6211W AREA: CARIBBEAN . SUMMIT ELEVATION: 3000 FT (915 M) . ADVISORY NUMBER: 2002/068 . INFORMATION SOURCE: GOES-8 IMAGERY. UPPER AIR SOUNDING. MONTSERRAT VOLCANO OBSERVATORY. . ERUPTION DETAILS: ONGOING ASH EMISSIONS SINCE 13/1130Z. . OBS ASH DATE/TIME: 13/1715Z . OBS ASH CLOUD: SFC/FL080 1643N6211W-1651N6319W-1634N6320- 1643N6211W MOVING W 15-20 KNOTS. . FCST ASH CLOUD+6H: SEE SIGMETS. . REMARKS: THE MONTSERRAT VOLCANO OBSERVATORY REPORTED A FAIRLY CONSIDERABLE PYROCLASTIC FLOW OCCURRED AT 1130Z BUT CONTAINED SMALL AMOUNTS OF ASH. SATELLITE IMAGERY THROUGH 1715Z INDICATED THAT THE ASH PLUME HAS BECOME MORE DENSE AND A SURFACE OBSERVATION FROM PLYMOUTH...MONTSERRAT AT 1700Z INDICATED ASH DRIFTING WEST....GALLINA/TURK . NEXT ADVISORY: WILL BE ISSUED BY 2002MAR14/0000Z. . NNNN