FORECASTING PRECIPITATION OCCURRENCE FROM PROGNOSTIC CHARTS OF VERTICAL VELOCITY

Abstract
An empirical study is made of the relationship of precipitation occurrence to vertical velocity and dewpoint depression. Based on this work, a method of forecasting precipitation occurrence is developed. The method uses two predictors, the prognostic charts of 500-mb. vertical velocity made by the JNWP Unit with a thermotropic model, and the dewpoint depression. Tests of the method suggest it is widely applicable in the eastern United States.

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