positive vorticity

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positive vorticity
Vorticity caused by cyclonic turning. Vorticity is a measure of rotation in the atmosphere, or “spin,” in the air. If the spin, as viewed from above, is counterclockwise in the Northern Hemisphere, it is called vorticity cyclonic and given a positive value (i.e., it is called positive vorticity). Positive vorticity is associated with the upward motion of air.

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