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An evaluation of short-period (2-7-hr) ceiling and visibility terminal forecasting techniques indicates that it is possible to prepare objective forecasts of these critical aviation weather parameters which yield a statistically significant improvement over those presently provided in routine operations. Two types of forecasts were examined: probability forecasts and categorical forecasts.
The study of the tornadoes of April 2, 1957, at Dallas, Tex., presented here is an assembly of independent efforts on some of the important aspects of these tornadoes and the associated weather situation. Each serves as a separate report on a specific aspect of the study