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PTC Matthew


PaEasternWX
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Edit: You may be right - I wasn't paying close attention to the microwave pass. It still shows two spiral bands north and south not visible on IR.

From a research paper in 2002 on Annular hurricanes:

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When compared to the greater population of tropical cyclones in an archive of infrared (IR) tropical cyclone imagery, these storms are distinctly more axisymmetric with circular eyes surrounded by a nearly uniform ring of deep convection and a curious lack of deep convective features outside this ring .   Because of this symmetry, these storms have also been referred to as "truck tires", and "doughnuts".  This appearance in satellite imagery can persist for days.

http://www.ssec.wisc.edu/~kossin/articles/Annular_hurricanes.pdf

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