There seems to be more than one way that horseshoe vortices form. Occasionally, the rotating updraft core of a relatively small sheared towering cumulus may remain after the "body" of the cloud dissipates, leaving behind a vortex that assumes a horse-shoe shape. In other cases, a horse-shoe vortex may form in clear air, without the precedence of a cumulus cloud. Clear air vortices of this type are often seen in the inflow field near supercell thunderstorms and are considered to be indicative of strong vertical wind shear.
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