FVXX20 KWBC 211030 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1030 UTC 21 MAR 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-051 WEST INDIES 16.72N 62.18W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY MONTSERRAT VOLCANO OBSERVATORY AND GUADELOUPE 21/0000 UTC SOUNDING. . ERUPTION DETAILS: ASH PRODUCING EVENT AROUND 20/2145 UTC. . DETAILS OF ASH CLOUD: SATELLITE IMAGERY THROUGH 20/0945 UTC DOES NOT INDICATE ANY ASH CLOUD. . TRAJECTORY: THE GUADELOUPE SOUNDING SUGGEST THAT ASH BELOW FL100 WOULD MOVE TO THE SOUTH-SOUTHWEST AT LESS THAN 10 KNOTS. ASH BETWEEN FL100 AND FL200 WOULD MOVE TO THE SOUTHEAST AROUND 15-20 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 SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED AROUND 21/1630. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN