On the basis of recent advances in the formulations of atmospheric stability and sea-surface roughness, a parameterization of overwater friction velocity (u*) is derived. It is shown that during hurricane conditions, u* can be obtained from U10, the wind speed at 10 m height. Verifications of the proposed equation against the correspondent data sets based on boundary-layer theories from three hurricanes are successful for operational applications.
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Vol. 2007 • No. 231