FVXX20 KWBC 140940 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0940 UTC 14 APR 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-105 WEST INDIES 16.72N 62.18W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915 M) . SOURCES OF INFORMATION: MONTSERRAT VOLCANO OBSERVATORY...INFRARED SATELLITE IMAGERY . ERUPTION DETAILS: INITIAL ERUPTION AT 11/0915 UTC. . DETAILS OF ASH CLOUD: THE MONTSERRAT VOLCANO OBSERVATORY HAS RECENTLY PHONED IN A SMALL EXPLOSION OF SOUFRIERE HILLS. THEY ESTIMATE THE ASH TOPS AT FL150. INFRARED SATELLITE IMAGERY INDCICATED A POSSIBLE ASH CLOUD LOCATED IMMEDIATELY TO THE EAST OF THE ISLAND AND CENTERED NEAR 16.7N/62.1W AT 0915 UTC. . TRAJECTORY: TOWARD THE WEST NORTHWEST AT LOW LEVELS BUT SATELLITE IMAGERY SUGGESTS A MOVEMENT TOWARD THE EAST AT HIGHER LEVELS ABOVE FL100. . 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 MESSAGE WILL BE ISSUED WITHIN THE HOUR. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN