Identification of independent rainstorms

Abstract An easily-applied approximate criterion is proposed for the separation of pointprecipitation records into statistically-independent storms. The criterion is tested successfully in parameter estimation for Poisson models of annual rainfall frequency in an arid climate. Analysis of rainfall records from a wide range of climates produces an empirical relation for estimating the minimum time between independent rainstorms, given only the mean annual rainfall and the mean length of the rainy season.