ON THE FORMATION OF THE PRECIPITATION ELEMENT IN A SHALLOW WARM-CLOUD

Taking consideration of the fluctuation in the vertical current, it is pointed out that the precipitation element will form more easily in a shallow warm-cloud. Under the assumption that the frequency distribution of the vertical current is Gaussian, the growth rate of the cloud droplet is calculated for a simplified cloud model. The result shows that even in a cloud with 1 km thickness the precipitation elements of radius greater than 100μ could be formed under average condition.