The general equation of motion for horizontal, frictionless motion is differentiated with respect to height. The total vertical wind shear is shown to be composed of five parts: the shear of (a) the geostrophic wind, (b) the local derivative, (c) the wind component due to the convergence or divergence of the streamlines, (d) the cyclostrophic component of the wind, and (e) the wind component associated with the vertical velocity. Except for the last term, which is smaller, these terms may be of the same order of magnitude.

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