Visible satellite map of the Grenadines and Barbados
The colors are cloud temperatures, normally the higher the clouds the colder.
Radar map East Caribbean
Rain in mm/hr, scroll to the left for legend
Radar image Guadeloupe to Grenada
The blue stuff is rain, green and yellow is serious rain. Dark yellow/orange is storm and hurricane.
A very large satellite image of the entire Atlantic:
(updated once a day)