Today's clouds that have developed, first just inland, and now all across the land as the ground warms up by the sun. What happens is the Sun warms the land, that causes the warmed air to rise up, as it rises, it gets cooler, so at a particular height, that then causes the moisture in the air to condense, forming clouds, typically lines of cloud.
So when this air has risen, it now has to be replaced, so cooler air comes in. So this effect follows the Sun, so that causes the normal Caribbean wind to move from east to west, following the Sun. That is why clouds and the wind often develop in the morning, then reduces in the late afternoon, because the Sun heating of the ground has then passed.