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Which comparison holds between theoretical and observed cyclone growth rates?

  • A.Dry theory gives growth rates that vary too little between different regions and different seasons
  • B.Dry theory overestimates the growth rate somewhat
  • C.Dry theory underestimates the growth rate because it omits the latent heat released during the ascent
  • D.They agree exactly

Answer: B

The dry Eady growth rate is somewhat larger than observed because it omits friction and the damping effect of the surface heat flux. Latent heat release does act to increase growth and so partly compensates, which is why the two effects are often discussed together. The theory does capture the regional and seasonal variation well, since it depends directly on the shear and stability. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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