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Which term describes a compact region of high vorticity travelling within the flow?

  • A.A vorticity maximum or vort max
  • B.A short wave trough, which is a feature of the height field rather than of the vorticity field itself
  • C.A jet streak
  • D.A potential vorticity anomaly, which is defined on an isentropic surface rather than a pressure surface

Answer: A

Forecasters track vorticity maxima on the 500 hectopascal chart because they move with the flow and their advection forces vertical motion downstream. Short wave troughs are the corresponding features in the height field and usually accompany them, jet streaks are wind speed maxima, and potential vorticity anomalies are the isentropic analogue. The terms are related but each refers to a specific field. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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