Discussion
Which view of cyclogenesis complements the normal mode picture?
Answer: A
The potential vorticity view describes cyclogenesis as the mutual amplification of an upper level anomaly and a surface thermal anomaly, each inducing a circulation that reinforces the other. It explains individual cases far better than a normal mode calculation, which describes the statistically preferred structure. Convective, frictional and radiative processes contribute but do not constitute alternative frameworks for the development itself.
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