While the effect of the trough to the NW on the system has been taken into account somewhat, I also see signs that a mid-upper level vortex at the southern base of this trough (south of Cuba) is beginning to register a signature on the WV. I have thought all morning that the trough had a cyclonic spin independent of the circulation of Isaac to explain it. If there is a developing upper level cyclonic feature, that will possibly affect the direction and the development of Isaac. There is certainly a sheared western segment with Isaac and maybe this is why?
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