FVXX20 KWBC 111930 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1930 UTC 11 APR 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-104 WEST INDIES 16.72N 62.18W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL SATELLITE IMAGERY. 1200 UTC GUADELOUPE UPPER AIR SOUNDING. US Navy REPORT . ERUPTION DETAILS: INITIAL ERUPTION AT 11/0640 UTC. . DETAILS OF ASH CLOUD: GOES-8 SATELLITE IMAGERY THOROUGH 1915 UTC DOES NOT SHOW ANY ASH SIGNATURES. THE US NAVY AT NORFOLK REPORTED RADAR RETURNS OF ASH IN THE MONTSERRAT AREA SO THERE IS PROBABLY LINGERING ASH IN THE AREA. THE 1200 UTC GUADELOUPE SOUNDING WOULD PUT THE HEIGHT AT ABOUT FL100. . TRAJECTORY:EAST TO EAST-SOUTHEAST AT 10 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. . THIS IS THE LAST MESSAGE ON THIS EVENT. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN