Here's a data point for the next time one passes by the Keys. We were in Largo on Sunday and Monday. Sunday morning, we awoke to find the National Hurricane Center and marine forecasts reporting that Gustav was 211 miles due west of Key West, and--I think--a Category 3 at the time. Marine forecast was saying 4-6 foot swells on the reefs. In Key Largo, there were scattered showers as the outer bands of the storm passed us, but it was often sunny, though breezy/windy. No dive boats went out that morning or in the afternoon. By Monday morning, when Gustav was well on its way to Louisiana, the winds were lighter, and we went diving! It was a bit rough out on the reef, but actually not as bad as predicted. However, the wind picked up in the afternoon, and the boat (well, Quiescence, at least) did not go out. So, at least we got in two dives. There was plenty of drinking to occupy us the rest of the time. I'm glad we were not scared off by the forecasts.