Abstract
Abstract The limited areal extent and evolving nature of convective storms over a small catchment near Johannesburg were investigated and an analysis of 21 storm events over the 10.4 km2 suburban catchment was carried out. Shapes of storms were modelled by a numerical surface fitting technique chosen after several alternative methods were compared for suitability. A model was developed, utilizing the chosen inverse squared distance technique, which enabled storm intensities to be simulated over the study catchment. The results of the study suggest that a spatial description of storm events at discrete time steps is a valuable approach for understanding the cellular composition of storm events and that the spatial variability of storms should be incorporated when studying the rainfall-runoff process.
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