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Which growth rate does the Eady model predict?

  • A.An e-folding time of a week
  • B.A growth rate that depends only on the latitude and not on the strength of the vertical wind shear
  • C.An e-folding time of about one day
  • D.An e-folding time of about one hour, which matches the development of an individual convective cell

Answer: C

The maximum growth rate is proportional to the shear divided by the buoyancy frequency, giving an e-folding time near 24 hours for typical mid-latitude values. That matches the observed pace at which cyclones develop from a barely visible wave to a mature system in two or three days. The rate depends strongly on the shear, which is the thermal wind, so it is not a function of latitude alone.

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