Ernesto has still been in very much re-formative stages of a tropical cyclone's life cycle. As such, the "center" may reform here and there. There have also been multiple centers. For much of this morning the low level center has been well-removed from his broad mid-level circulation's center, and recently I have noticed a bit of that potential jump HF referred to on page 7, for example. Even though the low level center is still arguably southwest of the center of the radar echos, in an intensifying system the low level center will typically like to co-locate back within the deepest convection, which at this time appears more co-located around the rough center of circulation suggested by radar.
Ernesto has always been a less than ideally organized system. In fact, even when he was declared a hurricane he did not have anything resembling a well-defined "eye," for example. While we are most likely talking about hours and not days before first landfall, he remains so disorganized that the actual "center" remains very much in play.
However, the most important thing here is not to get transfixed on his center. Unless he pulls a really unexpected fast one (which is always a possibility, of course, but not as likely) the worst weather threat from Ernesto will most likely be in the form of potentially flooding rains, and this threat covers a far greater area than the relatively smaller swath(s) of severe winds.
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