Discussion
Which insight does potential vorticity inversion provide about an upper level anomaly?
Answer: A
A compact upper level potential vorticity anomaly induces a cyclonic circulation that decays downward over a depth set by the ratio of the Coriolis parameter to the buoyancy frequency times the horizontal scale. This action at a distance is the basis of the modern potential vorticity view of cyclogenesis, in which an upper anomaly overtakes a surface thermal anomaly and the two amplify each other.
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