One of the main elements of the hidrolgico cycle is the process of precipitation, mainly the pluvial one, that is, the precipitations and the dynamics of distribution of the same ones is essential for the natural formation of habitats, in the construction of hidrolgico profile of the rivers and of its net of draining, also it acts significantly in the economic relations, influencing and being determinative in the practical ones of agriculture, cattle, tourism, commercial transport among others. (DREW, 1998) the distribution of pluvial precipitations also influences in the climatic dynamics of the diverse regions of the planet, being also expressive element in the climatic classifications. Rains also can determine the social relations in local scale, modifying the planning of projects, the civil construction, transfer, and modify directly in the daily one of the people, changing or modifying its routine. Therefore, it is of basic importance to understand the dynamics of the distribution of precipitations, leading in consideration the aspects of its initial formation inside of the hidrolgico cycle, elucidating the main linked phenomena its formation, such as, the process of condensation of the water, the evapotranspirao and the evaporation, the formation of clouds, the types of precipitation, the process of draining and infiltration of the water in the surface, that is, all the elements that the general dynamics of hidrolgico cycle composes, later, of the global distribution of precipitations. (TUBELIS, 1980) the condensation process occurs when vapor d? water originated from the process of adiabtica expansion of the air happened of the evaporation of the water of liquid bodies, as rivers, lakes, seas and oceans, and also for the evapotranspirao that is the capacity of loss d? water of the physiological structure of the bodies livings creature for latent heat, arrives the superior layers of the troposphere and finds microscopical particles in suspension, thus forming the calls condensation nuclei. .