IR Satellite, with MSLP and Frontal Analyses, at 06z, 09/18

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IR satellite image at 06z, 9/18/04. Overlaid on the satellite image are HPC MSLP, frontal, and lightning analyses. For the first time since Ivan was a major hurricane over the waters of the Gulf of Mexico, the pressures dropped during the last 6 hours. Such pressure falls were further indication that Ivan had transitioned to a baroclinic system.