The satellite photos of the Gulf SSTs from http://fermi.jhuapl.edu/ show SSTs offshore in the Gulf of 22-25 C, about 4-6 C cooler than before Dennis' passage. Those will likely recover quickly; it is the waters beneath that which we cannot readily measure that will take some time to recover, leading to the potential to impact Emily negatively directly over the past storm's path. Maybe in the NW Caribbean there are warmer waters away from Dennis' path, but that remains to be seen as to whether or not they will hold.
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Re: sat pics of emily