FVXX20 KWBC 301810 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1810 UTC 30 APR 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-121 WEST INDIES 16.72N 62.18W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915 M) . SOURCES OF INFORMATION: PILOT REPORT...MONTSERRAT VOLCANO OBSERVATORY...VISBLE GOES 8 IMAGERY . ERUPTION DETAILS: ASH VENTING EVENT AROUND 30/1732 UTC. . DETAILS OF ASH CLOUD: THROUGH THE 1745 UTC GOES-8 VISIBLE IMAGERY SHOWS ASH LEAVING THE ISLAND AND MOVING OFF TO THE NORTHWEST. THE ASH EXTENDS UPTO FL150 ACCORDING TO THE MVO. A PILOT REPORT INDICATES ASH TO FL100. . TRAJECTORY: NORTHWEST AT 15 TO 20 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. . ANOTHER MESSAGE WILL BE ISSUED ASAP TO INCLUDE A GRAPHIC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN