In the case of a vertically developing cloud where the temperature is above the freezing point, mass of rising air undergoes adiabatic cooling. In the ascending phase, the air mass reaches saturation point beyond which, water vapour content of the air mass condenses into liquid droplets. The droplets are too tiny to overcome the updraft and hence remain suspended in the atmosphere as cloud mass. The tiny droplets need particulate matter to serve as nuclei for the formation of larger drops, which in the turbulent environment, collide with each other and grow further in size till they are large enough to counter the updraft and fall to the earth as rain. This process of collision and growth leading to the formation of raindrops is called “Coalescence” and the method of seeding such clouds is called “Warm Cloud Seeding”. The method involves the introduction of hygroscopic nuclei such as calcium chloride. The seeding material in this case is released by burning flares below the base of the cloud from where is drawn up in the updraft and induces the process of formation of larger water droplets. Seeding material may also be released manually through a hopper fitted in the aircraft. Precipitation is expected in 25 to 30 minutes of seeding. Compared with Cold Cloud Seeding, it is more difficult to extract rain through Warm Cloud Seeding.