In recent years, Numerical Weather Prediction (NWP) plays an important role in short-range rainfall predictions.These can be defined as predictions of no longer than one week in advance.The atmospheric physical parameters have been continuously developed for the NWP These parameters are implemented into NWP models based on equations derived from theoretical assumptions based on observations and physics of the event.On this respect, physics of clouds gives rise to various equations for implementation of parameters into the NWP.These various methods of implementation are called Cumulus Parameterization schemes (CP).