Finally, still variation in relation to the regimen of precipitations inside of the diurne scale exists, that is, during the day the variations occur due to the effect of the difference of heating of the surfaces eliminate and terrestrial, mainly in the interior of the continent and the regions of open or next sea to the coast, thus, the precipitation regimen diurne of the continental or interior type and the maritime or littoral type meet. In the continental or interior type, rains occur with priority during the end of the morning or the afternoon, where the thermal saturation of the surface arrives the extreme conditions, making with that air if becomes lighter, thus suffering the adiabtica expansion, forming clouds of convective origin, as well as, convective precipitations. In the maritime or littoral type the precipitations reach more significant occurrence during the night and in the first hours of the morning, this occurs according to Nieuwolt apud Ayoade (1986, p.170) ' ' for some type of nocturnal convection, that results in the increase … of thermal variation to the measure that the superior troposphere is cooled by the losses for radiation from the top of nuvens' '. Finally, the hidrolgico cycle is a systematic mechanism of the planet to keep its conditions general bioptics in constant balance, for this has a cyclical interaction between the solar radiation, the lithospere, the hidrosfera, the biosfera and mainly the atmosphere. The hidrolgico cycle, therefore, encloses and interacts direct and indirectly with all the terrestrial subsystems, in the evaporation interact with the hidrosfera, in the evapotranspirao interact directly with the biosfera, that automatically are integrated the lithospere that is determinative in the effect of the continentalidade, and, therefore, in the sazonal and diurne variation of precipitation, beyond the superficial draining and of the process of infiltration occurred after the precipitation events, with atmosphere interact in such a way through the cloud formation that will give to origin precipitations, carrying through, the closing of the hidrolgico cycle.

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