Discussion
Which minimum shear does the two-level model require for instability?
Answer: A
The two-level model gives a critical shear below which all wavelengths are stable, a result arising from the beta effect stabilising the long waves. Observed shears exceed the critical value over the winter storm tracks, which is why cyclones form there. The Eady model, which has no beta effect, finds instability at any shear, so the difference between the two models is instructive. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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