I hope this link works for you. There seem to be surface features that would carry, push, Sargassum down into the Caribbean. There is some on the northern shores of the US Virgins. http://www.ssd.noaa.gov/goes/east/carb/flash-avn.html Cheers, Melissa ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Melissa E. Keyes St. Croix, U.S.Virgin Islands