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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.
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