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National Hurricane Research Project

In an effort to determine the nature of the thermal field in the vicinity of developing tropical cyclones as distinguishable by use of data from the existing operational network, thickness charts were constructed for the West Indies area. The development of thirteen Atlantic storms was investigated, these being chosen from the population of 1958-1962 Atlantic storms by including only those favorably situated relative to the data network. To serve as a control group, nine disturbances which failed to develop were . treated in the same manner. The method of analysis of the thickness charts is discussed. The thickness and shear patterns in the vicinity of the storms are described, and comparison made between developing and non-developing cases. Changes in the thickness pattern as development proceeds are discussed briefly. Several different thickness layers are compared and rated for their usefulness in delineating the above patterns. Finally, the operational utility of thickness charts as an aid in predicting cyclogenesis is evaluated.