What are the ingredients in cloud formation?
condensation nuclei, moisture, and lifting mechanism
Three factors that must be present for cloud formation are; hydroscopic nuclei, moisture, and cooling process. Amounts of the above affect cloud formation. Do you mean the affect of precipitation? Or does this answer your question? Furthermore, Precipitation will affect the mass of a cloud as well as evaporation and sublimation. Hope this helps.
Adiabatic cooling relates to cloud formation in such, when it pushes air out of the way when rising, energy is released into the surroundings and the air cools "adiabatically." When the air that is cooling meets up with other air that is in the same situation, a cloud starts to forms, and when that cloud forms, it cools enough when it reaches a certain altitude and rains.
They are not necessarily important for planetary formation - directly, but they are important for the formation of solar systems and stars. When a molecular cloud exists, it will without any external intervention, stay as a molecular cloud. A supernova explosion nearby, gives the molecular cloud impetus and this starts the process of stellar evolution. [See related question] See other related questions.