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Myron K. Cox

Radar data are used to investigate wintertime cold-front precipitation patterns in the vicinity of Cambridge, Massachusetts. No significant correlation was found to exist between the extent of precipitation as indicated by radar-scope coverage and selected synoptic parameters—with the exception of the Instability Index which proved to be significant at the 5 per cent level. Further comparison is made between the average precipitation amounts as indicated by the climatological network of rain gauges and the same synoptic parameters. Again, a significant correlation was found to exist only for the Instability Index.

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Myron K. Cox

A thunderstorm forecast technique is evaluated on a day by day basis during the months May through September, 1960. The over-all verification probability is 0.92. In a comparison test with persistence forecasts, the semi-objective method has a 24 per cent greater verification probability and shows more than thrice the skill factor.

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Myron K. Cox

Thunderstorms and associated weather in the region of Eastern Virginia are discussed, and a semi-objective technique is presented for forecasting the phenomena. A new stability value is presented as a convective forecasting facility. The forecast method herein described had an overall verification probability with dependent and independent data of 0.88 and 0.92, respectively.

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