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stormchazer -- probably just a sign of the differentiation between the well-defined core of the storm and an outer convective band and not a sign of dry air entrainment. I could be wrong, but I don't believe that there is dry air becoming entrained into the storm.
The last few frames of the WV loop shows dry air building in the Bay of Campeche. But you're right, it doesn't appear to be affecting Dennis at this time.
http://www.ssd.noaa.gov/PS/TROP/DATA/RT/gmex-wv-loop.html
Allison
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