FVXX20 KWBC 171800 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1800 UTC 17 JUNE 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-154 WEST INDIES 16.7N 62.2W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000FT (915M) . SOURCES OF INFORMATION: MONTSERRAT VOLCANO OBSERVATORY. 1200 UTC GUADELOUPE SOUNDING. . ERUPTION DETAILS: REPORTED ERUPTION 17/1000 UTC TO FL150. . DETAILS OF ASH CLOUD: ASH FROM THE EARLIER ERUPTION OF SOUFRIERE HILLS MOVED WESTNORTHWESTWARD FROM THE VOLCANO AND DISSIPATED OR MERGED WITH CLOUDS NEAR PUERTO RICO. THE LAST GOES8 IMAGE THAT SHOWED THE ASH WAS AT 1600 UTC. AT THAT TIME THE ASH WAS NEAR 17.1N 64.5W WHICH IS 250 KM (135 NMI) WEST NORTHWEST FROM THE VOLCANO. . TRAJECTORY: THE 17/1200 UTC GUADELOUPE UPPER AIR SOUNDING SUGGEST THE ASH AT THIS REPORTED LEVEL WOULD MOVE TOWARD THE WEST 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 LATEST SIGMETS. . THIS WILL BE THE LAST MESSAGE FOR THIS EVENT. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN