Before you go to Cooper pull up the webcam and see what you see there....I used to pull it up the exact day of week 1 week prior.
http://cooperisland-bvi.com/current.jpg Between the hassle mooring that boatyball created and bad restaurant service Cooper doesn't make our cut with all the better choices around
Foxys has a webcam as well but you really cant see the Mooring field. My advice if you want to go to Great Harbour JVD go instead to Little Harbour or even better Diamond Point and land taxi over to Great Harbour, JVD