FVXX20 KWBC 081500 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1450 UTC 08 APR 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-097 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. 1200 UTC GUADELOUPE UPPER AIR SOUNDING. MONSERRAT VOLCANO OBSERVATORY. . ERUPTION DETAILS: INITIAL ERUPTION AT 08/0204 UTC. ADDITIONAL ERUPTION AT 08/1400 UTC. . DETAILS OF ASH CLOUD: UNDISCERNIBLE ON SATELLITE IMAGERY DUE TO EXCESSIVE CLOUD COVER. . TRAJECTORY: UPPER AIR SOUNDING INDICATES ASH BELOW FL100 WOULD MOVE TOWARDS THE SOUTHEAST AT 10 TO 20 KTS. ASH BETWEEN FL100 AND FL150 WOULD MOVE TOWARDS THE EASTSOUTHEAST AT 20 TO 30 KTS. ASH ABOVE FL150 WOULD MOVE TOWARDS THE NORTHEAST AT 40 TO 60 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 ISSUED AROUND 08/2100 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN