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ON THE WIND ASYMMETRY OF HURRICANES

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  • 1 Los Alamos Scientific Laboratory
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Abstract

The difference in the wind speeds across hurricanes (from the “dangerous” to the opposite semi-circle) is often greater than twice the speed of propagation of the storm. The traditional explanation of the speed asymmetry of such storms must, then, be regarded as only a partial one. A speed asymmetry (in the same sense) must exist in the wind field as seen by an observer moving with the storm. Simple reasoning in terms of non-fluence lines (loci of points of parallel flow) applied to the simple model of a hurricane, consisting of a cyclonic indraft point plus its associated hyperbolic point, leads to the expected asymmetry in the relative field of flow.

Abstract

The difference in the wind speeds across hurricanes (from the “dangerous” to the opposite semi-circle) is often greater than twice the speed of propagation of the storm. The traditional explanation of the speed asymmetry of such storms must, then, be regarded as only a partial one. A speed asymmetry (in the same sense) must exist in the wind field as seen by an observer moving with the storm. Simple reasoning in terms of non-fluence lines (loci of points of parallel flow) applied to the simple model of a hurricane, consisting of a cyclonic indraft point plus its associated hyperbolic point, leads to the expected asymmetry in the relative field of flow.

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