FVXX20 KWBC 150600 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0600 UTC 15 APR 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-110 WEST INDIES 16.72N 62.18W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915 M) . SOURCES OF INFORMATION: INFRARED AND MULTISPECTRAL GOES-8 SATELLITE IMAGERY...0000 UTC GUADELOUPE UPPER AIR DATA . ERUPTION DETAILS: INITIAL ERUPTION AT 14/0915 UTC. . DETAILS OF ASH CLOUD: NO ASH CLOUD COULD BE DISCERNED IN EITHER INFRARED OR MULTISPECTRAL IMAGERY THROUGH 0415 UTC...THE LAST IMAGE PRIOR TO ECLIPSE. A LOW LEVEL ASH CLOUD HAD STILL BEEN DETECTED IN YESTERDAYS FINAL VISIBLE IMAGES BUT THE LOW LEVEL NATURE OF THE ASH CLOUD...TOPS ESTIMATED AT FL050...PRECLUDES DETECTION IN INFRARED OR MULTISPECTRAL IMAGERY. CAUTION IS STILL ADVISED. . TRAJECTORY: ANY ASH CLOUD AT OR BELOW FL050 WOULD MOVE TOWARD THE WEST NORTHWEST AT 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 AND VAFTAD. . THE NEXT MESSAGE WILL BE ISSUED BY 15/1200 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN