- 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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Positive vorticity advection — Positive vorticity advection, or PVA, is the result of higher values of vorticity advecting into lower values of vorticity. DevelopmentVorticity in the atmosphere is created in three different ways, which are named in their resultant vorticity.… … Wikipedia
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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 a vorticity cyclonic and given a positive value. If the spin is clockwise, it is… … Aviation dictionary
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