In the favorable topography of the Region it seems to be .causing in scale local, for rains windward that are detachable rainier than of lee-side, in some places, the valley circulation and of mountain it seems admirable and all the events above cited, more deserve detailed comments, so that the causes of the climatic irregularity are evaluated more good northeastern. In a similar way, it cites AYOADE on the atmospheric circulation. The basic basic cause of the atmospheric, horizontal or vertical movement, is the disequilibrium in the liquid radiation, the humidity and the momentum between the decreases and the high latitudes and enters the surface of the Land and the atmosphere. Other factors that influence the atmospheric circulation are the topography, the oceanic distribution of the continental and oceanic surfaces and chains. (AYOADE, 2007.p. 72) THE ATMOSPHERIC NORMAL CIRCULATION OF THE NORTHEAST REGION To the extensive one of one line, almost parallel to the equator, the air masses of the two hemispheres if strike establishing the Intertropical Front. The increase in the set of air in the Intertropical Front produces a band of ordeiras called doldrum, zone of heavy showers and thunderstorms.
, Thus conditional for the general movement of the Sun in the ecliptic, the disposal of this front that varies with the stations of the year. Possessing in the hemisphere North the biggest continental area, it is on average hotter than the South hemisphere. Therefore the great cold air mass of this last one keeps the Intertropical Front, on average, above of the equator. In the summer north the mentioned front if comes across about 10 North, reaching its final position in September, when the Antarctic polar region this cold. In the south summer, it if it locates next to the equator, to reach its southern extreme position in March, needed now to the intense cooling of the Arctic Polar region.