Incidence of 'warm' and 'cold' rain in and around Delhi, and their contributions to season's rainfall

Abstract

Based on study, using radar, of frequency distribution of rain cells of different types, classified according to their vertical structures, their average areal extents, and associated mean rates of precipitation, an attempt has been made to estimate the relative contribution of 'warm' and 'cold' rain to natural rainfall over the area around Delhi, in northwest India, in different seasons. It is seen that, while occurrences of rain form warm clouds in the area generally lire by no means infrequent, particularly during southwest monsoon season, the actual yield of such rain is quite small. On the basis of data collected, possibilities of rain augmentation in the region by warm seeding techniques have been considered in a general way.