FVXX23 KWBC 090120 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0120 UTC 09 DEC 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-266 WEST INDIES 16.7N 62.2W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL SATELLITE IMAGERY...MONTSERRAT VOLCANO OBSERVATORY...1200 UTC SOUNDING FROM GUADELOUPE... . ERUPTION DETAILS: ERUPTION AROUND 08/1715 UTC. . DETAILS OF ASH CLOUD: THE MVO EARLIER REPORTED A SMALL ERUPTION CAUSED BY ROCKFALLS. THE ASH CLOUD NOTED EARLIER IS NOT DETECTABLE IN MULTISPECTRAL OR INFRARED IMAGERY AS OF 09/0045 UTC. HOWEVER IT WAS WELL DEFINED IN THE VISIBLE SATELLITE IMAGERY SEVERAL HOURS AGO AND IT IS BELIEVED THAT SOME PORTION OF THE ORIGINAL ASH CLOUD DOES STILL EXIST. THE ASH IS LOW-LEVEL AND IS ESTIMATED TO HAVE A MAXIMUM HEIGHT OF FL100. . TRAJECTORY: MOVEMENT TO THE SOUTHWEST AT 15 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 http://www.ssd.noaa.gov/VAAC/washington.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS. . EFFECTIVE JANUARY 3 2000 AT 0000 UTC... ALL REFERENCES TO LATITUDE AND LONGITUDE IN VOLCANIC ASH ADVISORY STATEMENTS WILL BE IN DEGREES AND MINUTES OF A DEGREE. EXAMPLE... 16.70N 62.20W WILL BE 1642N6212W . THE NEXT STATEMENT WILL BE ISSUED AROUND 09/0730 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN