FVXX20 KWBC 210430 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0430 UTC 21 JAN 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-025 WEST INDIES 16.72N 62.18W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915 M) . SOURCES OF INFORMATION: MONTSERRAT VOLCANO OBSERVATORY..GOES-8 INFRARED AND MULTISPECTAL IMAGERY 0000 UTC GUADELOUPE UPPER AIR SOUNDING . ERUPTION DETAILS: ERUPTION OCCURRED APPROXIMATELY 20/2031 UTC. . DETAILS OF ASH CLOUD: GOES-8 IMAGERY THROUGH 0345 UTC IS NO LONGER ABLE TO DETECT THE ASH CLOUD THAT EXTENDED WEST OF THE ISLAND. AS THE ASH MOVED WEST AND BECAME MORE DIFFUSE IT WAS OVERTAKEN BY METEOROLOGICAL CLOUDS WHICH HAVE OBSCURED THE RESIDUAL ASH DETECTION. THE VOLCANO OBSERVATORY ALSO REPORTS NO MORE SIGNIFICANT ACTIVITY AT THE VOLCANO. WE WILL CONTINUE TO MONITOR THE AREA. . TRAJECTORY: ANY ASH BELOW FL110 WILL MOVE WEST AROUND 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 LATEST SIGMETS AND VAFTAD. . THIS WILL BE THE LAST STATEMENT UNLESS ASH IS AGAIN DETECTED OR ANOTHER ERUPTION IS REPORTED. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN