Abstract

Abstract The frequency distributions of thunderstorm durations were analyzed for 30 years at 36 stations in the United States in order to develop an appropriate summarizing statistic for durations. The incomplete gamma function provides a close fit to the observations for all stations and can be used to specify for any station the probability of encountering storms with any selected range of durations. Preliminary analyses of the spatial and seasonal distribution of the coefficients suggest that regional clusters occur, indicating the potential for the development of a nationwide thunderstorm duration climatology. Storms lasting 3 h or longer are infrequent but display a spatial pattern differing from that of short duration storms.

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