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Wind data at and above the 500-mb level taken from the El Paso, Tex., rawinsonde Station (rawin) and pressure-height data at the same levels from Albuquerque, N. Mex., Midland, Tex., Tueson, Ariz., and Chihuahua, Mexico, during the 1965–66 winter and the 1966 summer periods were used to study geostrophic wind deviation. Geostrophic winds were computed directly from the pressure-height data by a finite-difference method and compared to the actual wind as measured at El Paso. The variations of the “apparent” geostrophic wind deviation with wind speed and pressure-height were examined. Errors involved were analyzed and the “true” geostrophic wind deviation and the total wind accelerations were estimated. Results of the study reveal: (1) that despite the improvement in the accuracies of the radiosonde pressure-height and rawin data, the errors in the data still account for a large portion of the apparent geostrophic wind deviation at higher levels (at and above the 150-mb level); (2) that to use the ...

In Part 1 of this paper a free-streamline wake model was introduced to treat the fully and partially developed wake flow or cavity flow past an oblique flat plate. This theory is generalized here to investigate the cavity flow past an obstacle of arbitrary profile at an arbitrary cavitation number. Consideration is first given to the cavity flow past a polygonal obstacle whose wetted sides may be concave towards the flow and may also possess some gentle convex corners. The general case of curved walls is then obtained by a limiting process. The analysis in this general case leads to a set of two functional equations for which several methods of solution are developed and discussed.As a few typical examples the analysis is carried out in detail for the specific cases of wedges, two-step wedges, flapped hydrofoils, and inclined circular are plates. For these cases the present theory is found to be in good agreement with the experimental results available.