FVXX20 KWBC 110700 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0700 UTC 11 SEPTEMBER 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-218 WEST INDIES 16.7N 62.2W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915 M) . SOURCES OF INFORMATION: MONTSERRAT VOLCANO OBSERVATORY...0000 UTC GUADELOUPE RADIOSONDE...GOES-8 INFRARED SATELLITE IMAGERY... ERUPTION DETAILS: ERUPTION AT APPROXIMATELY 11/0025 UTC. . DETAILS OF ASH CLOUD: THE MONTSERRAT VOLCANO OBSERVATORY REPORTED AN ERUPTION OF SOUFRIERE HILLS. THE HEIGHT OF THE ERUPTION IS UNKNOWN DUE TO NEAR ZERO SURFACE VISIBILITY AND VERY DENSE RAIN CLOUDS ASSOCIATED WITH HURRICANE FLOYD. SATELLITE IMAGERY THRU 0345 UTC DID NOT DETECT ANY ASH FROM THIS ERUPTION DUE TO THE CLOUDS FROM HURRICANE FLOYD. TRAJECTORY: ANY ASH AT ALL FLIGHT LEVEL WOULD MOVE TOWARD THE EAST AT 10 TO 20 KNOTS. . REAL TIME SATELLITE IMAGERY ALONG WITH 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/washington.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS. . THIS WILL BE THE LAST MESSAGE FOR THIS EVENT . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN