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Abstract
It is demonstrated theoretically that showers may be released by coalescence from shallow cumulus, only 1 km deep, lasting for one hour and having cloud-droplet spectra typical of those measured in clouds formed in clean, maritime air. In clouds formed in more heavily polluted continental air and which have higher concentrations of smaller cloud droplets, the coalescence process is delayed and retarded so that, under otherwise comparable conditions, the time required for shower formation is considerably increased.