Cre8, we were diving the reef off San Pedro during the 3rd week after Wilma tossed Cozumel and Cancun 2 years ago. There was a lot of particles in the water lowering the visibiliey some but it was ok. I imagine the reefs out on the atolls, like lighthouse, might clear up a little faster. I would think dive trips to the Blue Hole will depend on the wind, waves and weather that day which will have nothing to do with Dean. Im sure you will have a gr8 trip.