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Which wavelength grows fastest in the Eady model?

  • A.About 1000 kilometres, which is the deformation radius in the mid-latitude troposphere at present
  • B.About 4000 kilometres
  • C.About 400 kilometres, which is comparable with the width of an individual frontal rain band observed
  • D.About 40000 kilometres

Answer: B

The Eady model gives a most unstable wavelength of roughly 4000 kilometres, close to the observed spacing of mid-latitude cyclones, and a growth rate corresponding to an e-folding time of about a day. The agreement with observation is what made the model so influential. The deformation radius is smaller by a factor of about four and sets the scale rather than the most unstable wavelength directly.

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