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Some rather impressive microwave imagery just in:
http://www.nrlmry.navy.mil/tc_pages/tc07/ATL/04L.DEAN/tc_ssmis/91h/1degreeticks/full/Latest.html
Very strong internal structure, it appears.
I do not understand what is going on with Dean. The pressure has reached the lowest levels, yet the winds have now gone down (to 145mph as of the 11pm advisory). The ERC is clearly nearing completion, or from that image, it looks to be completed. My gut tells me that the 145mph wind reading is understated, and that if it has weakened, it will be very temporary, given the somewhat significant pressure drop (from 930 to 916-918). Throw in the diurnal maxima, and Dean has all the makings of a Cat 5 at any time now.
When a storm has a dual eyewall structure, the wind field becomes somewhat "diluted," for lack of a better term. The wind profile becomes rather broad and flat while both eyewalls compete for energy. Eventually, the outer one takes over and significant deepening (both of pressure and winds) can occur. Truthfully, the deepening we've seen tonight during the ERC of Dean's pressure is more the exception than the norm; usually the pressure will tend to rise somewhat during the eyewall cycles. Not sure why this hasn't happened with Dean, though my initial thoughts center on that warm water eddy it is passing very close to tonight.
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Re: Dean v. Louisiana?