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Abstract
It is shown that charges may be separated in large cumuli as a result of negative charging of growing ice particles by collision with supercooled droplets. The magnitude of the effect has been calculated and it has been shown that charges comparable to those involved in thunderstorms can develop, providing the water content and updraught velocity in a cloud are high. The hypotheses lead to conclusions which agree, qualitatively and quantitatively, with the known physical characteristics of thunderclouds.