Discussion
Which interaction produces rapid cyclogenesis in this framework?
Answer: A
When an upper potential vorticity anomaly arrives upstream of a low level warm anomaly, each induces a circulation that reinforces the other and the pair amplifies while remaining tilted against the shear. This is baroclinic instability expressed in potential vorticity language. It explains individual cases far better than a normal mode calculation does. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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