FVXX20 KWBC 110500 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0500 UTC 11 JUNE 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-150 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 SATELLITE IMAGERY. THE MONTSERRAT VOLCANO OBSERVATORY. . ERUPTION DETAILS: ERUPTION AROUND 11/0430 UTC . DETAILS OF ASH CLOUD: THE MONTSERRAT VOLCANO OBSERVATORY REPORTS AN ERUPTION OF SOUFRIERE HILLS TO FL100. ACCORDING TO THE UPPER AIR SOUNDING FROM GUADELOUPE THE ASH IS MOVING TOWARDS THE WEST. EXTENSIVE CLOUDINESS IN THE VICINITY OF THE VOLCANO MAKES ANY ASH DETECTION AT THIS TIME DIFFICULT. WE WILL MONITOR THE AREA AND SEND ANOTHER MESSAGE AS SOON AS THE ASH CAN BE DETECTED IN IMAGERY. . TRAJECTORY: ASH TO FL100 WILL MOVE TOWARDS THE WEST AT 12 KTS. . 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 SENT AT 11/1100 UTC OR EARLIER IF ASH CAN BE DETECTED IN IMAGERY. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN