I don't know if I need to justify my above post on the Cayman's dropping the Hurricane Watch or not. But I will.

I have learned to Never Ever drop your guard on a Tropical Cyclone that is South of your location.
Whether it's S, SE, or SW. It can turn.
Along the same line I personally watch them until they are above my Latitude also.

Here are the NHC coordinates for the Caymans.

Grand Cayman -- GC 19.32 -81.26
Little Cayman, Cayman Brac -- GC 19.70 -79.94

While the current Model Forecasts take Ernesto East of the Caymans, forecast can and do change. As do the intensity forecasts.