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Storm motion can help alleviate the influence of shear (or similarly, strengthen its influence). You'll see storms under southwesterly shear ahead of a trough strengthen as they recurve and accelerate because of the lessened impacts of the shear upon the storm. You'll still see asymmetries result from the storm motion, but not as much of a negative impact due to the shearing winds. It's all relative, as they say, so shear does work in a storm-relative sense. |