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From the latest IR image it looks like Gustav is going through an eyewall replacement cycle at this time. The image shows the ragged inner eye surrounded by an outer eyewall. It's likely Gustav will not strengthen until the cycle is complete. I remember Katrina expanding it's windfield when this happened prior to becoming a Cat 5 hurricane over the warm Gulf loop.
It's often fool's bait to rely on IR images to determine whether or not an ERC is underway.
Stick to the data from recon, and available radar. These do not show any imminent ERC.
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