FVXX20 KWBC 210730 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0730 UTC 21 May 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-133 WEST INDIES 16.7N 62.2W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000FT (915M) . SOURCES OF INFORMATION: GOES 8 MULTISPECTRAL SATELLITE IMAGERY...0000 UTC GUADELOUPE SOUNDING DATA . ERUPTION DETAILS: ERUPTION AT 20/2140 UTC . DETAILS OF ASH CLOUD: NO ASH WAS DETECTED ON THE SATELLITE THROUGH 21/0702 UTC. . TRAJECTORY: ANY REMAINING ASH WOULD CONTINUE TO MOVE TOWARD THE WEST 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. . THE NEXT MESSAGE WILL BE ISSUED AROUND 21/1330. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN