Dropsonde data from the eyes of tropical cyclones are used for testing old and deriving new empirical relationships between the surface pressure and the heights of constant-pressure surfaces. The derived regressions are used for the preparation of a nomogram which can be used for estimating surface pressure in the eye of a tropical cyclone from aircraft pressure-height data at any level between the surface and 500 mb. The regressions also provide a basis for some comments on the mean thermal structure of the eye.
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C. L. Jordan (1958) studied this question.