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Aviation Glossary :: Vorticity  Aviation Glossary :: Vorticity FAA Written Test Preparation
Aviation Glossary Welcome to the Dauntless Aviation Glossary!

At Dauntless, our editorial staff maintains the web's largest unified glossary of aviation terms. This glossary is built from a combination of official, quasi-official, and proprietary sources (including original material that we develop oursselves). Uniquely, we often provide multiple definitions of a given term so that you can find that which best applies to you. In order to maximize your learning efficiency, this glossary (and similar ones for our international users) is incresingly fully integrated into our aviation learning apps, including our FAA written test prep and FAA practical test prep software and apps. If you like this glossary, you'll love them with their polished learning environments and world's best and clearest content (please do give them a try.).

Vorticity
Vorticity
Turning of the atmosphere. Vorticity may be imbedded in the total flow and not readily identified by a flow pattern.
  1. absolute vorticity-the rotation of the Earth imparts vorticity to the atmosphere; absolute vorticity is the combined vorticity due to this rotation and vorticity due to circulation relative to the Earth (relative vorticity).
  2. negative vorticity-vorticity caused by anticyclonic turning; it is associated with downward motion of the air.
  3. positive vorticity-vorticity caused by cyclonic turning; it is associated with upward motion of the air.
  4. relative vorticity-vorticity of the air relative to the Earth, disregarding the component of vorticity resulting from Earth's rotation.
source: FAA Aviation Weather for Pilots (AC 00-6A)
A measure of the rotation of air in a horizontal plane. Positive (counter-clockwise or cyclonic) vorticity can be correlated with surface low development and upward vertical motion (in areas of positive vorticity advection).
source: NOAA National Weather Service Glossary

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