Part of the reason the gulf is cooler, slightly, but still WAY above the temp needed for a system to grow, is because of all the rain and cloud cover this summer.
I check temps. They are slightly lower in the Gulf, but way above normal over the last 100 years and certainly high enough to produce a Cat 5 in a heartbeat.
Now, Katrina did weaken slightly before landfall. It did move from water that was near 90 into water that was around 85. That is part of the reason that she couldnt sustain cat 5++. But remember, she moved north the last 24-36 hrs before landfall, after a consistent nw track, because she was picked up by an upper low. That caused most of the dry air/shear/weakening that took her down to a strong cat 3 at landfall.
So what Im saying is that there is not 1 square inch in the gulf cool enough to inhibit growth from any system. Other factors would have to be present.
In fact, the waters of the gulf are warm enough these days to support systems almost year round. See 2005........




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The last time we had one named Jerry it went ashore for a couple of days then returned to the ocean. BTW, did you notice that monster storm right off Florida's east coast?
