ON THE CONDITIONS OF WARM RAIN FORMATION IN CUMULUS CLOUDS

The heights of rain formation in cumulus clouds with various vertical velocities, microstructures and cloud base temperatures are calculated, using a warm-rain formation model. The calculated results agree fairly with the observed heights of the cumulus clouds wiith 50% probability of raining in many regions in the world It is found that the rain formation heights differ appreciably and depend mainly upon the vertical velocity and to less degree on microstracture and cloud base temperature.