Abstract
Abstract Field evidence of high ice crystal concentrations in cumulus clouds at temperatures warmer than −10°C is consistent with the operation of a Hallett-Mossop “multiplication” process. This mechanism requires the generation of large drops in the cloud below the −8°C level, which is governed in turn by the cloud base temperature and cloud drop concentration. These two parameters are shown to he useful in delineating a “multiplication boundary,” separating cloud conditions in which multiplication takes place from those in which it does not.
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