Abstract
This note derives an analytical approximation for steady-state hurricane intensity in the three-layer model of Ooyama (1969). As in the more realistic but involved theory of Emanuel (1986), the square of the maximum wind speed is roughly proportional to the ratio of entropy to momentum exchange coefficients, times a measure of the ambient thermal disequilibrium between the sea surface and the upper troposphere. The analytical approximation compares favourably to a set of three-layer numerical simulations that covers a broad range of parameter space. Limitations of the analysis are briefly addressed, and a supergradient wind correction is estimated. Copyright © 2010 Royal Meteorological Society
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