Raadar studies of rain with special reference to initial release of precipitation in clouds over Poona

Abstract

The temperature at which the first precipi-tation echo appears on radar-scope and the thickness of the cloud at the time are con-sidered to be an indication of the nature of the processes involved in the initial release of precipitation in clouds. Several workers in the United States, Australia and England have tried to analyse the evidence of first precipitation radar echoes in their study, of the contribution of ice-crystal and coales-cence processes to the formation of rain. Most of these observations have, however, been made in the extra-tropical regions, Koteswaram and De (1959) have recently reported radar observations of first precipita-tion echoes over Calcutta.