FVXX20 KWBC 212220 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2220 UTC 21 MAR 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-053 WEST INDIES 16.72N 62.18W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE IMAGERY. PILOT REPORT AND MONTSERRAT VOLCANO OBSERVATORY. 1200 UTC GUADELOUPE SOUNDING. . ERUPTION DETAILS: ASH PRODUCING EVENT AROUND 21/2000 UTC. . DETAILS OF ASH CLOUD: A PILOT REPORT WAS RECEIVED AT 2200 UTC STATING AN ASH CLOUD WAS 30 MILES WEST OF MONTSERRAT. THE VOLCANO OBSERVATORY HAS CONFIRMED A ROCKFALL THAT PRODUCED SOME ASH THAT HAS BEEN PICKED UP BY THE WIND. VISIBLE SATELLITE IMAGERY THROUGH 2130 UTC SHOWS THE FAINT ASH CLOUD MOVING WEST (270 DEGREES) FROM THE ISLAND EXTENDING 40 KM (22 NMI) FROM THE VOLCANO. THE PILOT REPORTED ESTIMATED THE HEIGHT OF THE ASH AS FL080. . TRAJECTORY: ASH BELOW FL100 WILL MOVE WEST AROUND 10 TO 15 KNOTS. . THIS AND OTHER VOLCANIC ASH ADVISORY STATEMENTS OFTEN ACCOMPANIED BY A MAP DEPICTING ASH LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS www.ssd.noaa.gov/VAAC/messages.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED AROUND 22/0430 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN