Shear may not be the most appropriate term, though I know I've referred to it numerous times with this storm. What is happen is that westerly flow across the cyclone at all levels (~20-30kt) is helping to result in the asymmetric appearance on satellite imagery with Alberto. Dry air is certainly helping to suppress convection near the center as well, but I believe it is the two factors working in concert with one another that is leading to what we are seeing. Technically, it's not wind shear, but it is a similar process.
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