- 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.

*Aviation dictionary.
2014.*

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