FVXX20 KWBC 311230 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1230 UTC 28 MAY 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-143 WEST INDIES 16.72N 62.18W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915 M) . SOURCES OF INFORMATION: GOES-8 SATELLITE IMAGERY 0000...UTC GUADELOUPE SOUNDING . ERUPTION DETAILS:ERUPTION OBSERVED ON SATELLITE IMAGERY BEGAN AT 31/1030 UTC AND IS CONTINUING AT THIS TIME. . DETAILS OF ASH CLOUD:ASH CLOUD ESTIMATED AT FL050 EXTENDING TO THE POINT 16.72N 62.37W IS 12 NMI LONG AND 6 NMI WIDE. . TRAJECTORY: WEST AT 10KT. . 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 AT 31/1830 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN