Therefore, the absorbed humidity of the ocean more transposes until great heights, becoming the sector occidental person of the maritime tropical mass contained to the instability that the eastern sector. The thermal inversion that is higher the west, increases gradual for north in direction to the Intertropical Convergence and for the southwest in direction to the polar front, until disappearing in these discontinuities. In accordance with Blacksmith, on the displacement of the winds for the Region affirms. Throughout the Zone of Intertropical Convergence, the heating of air on waters hottest of the oceans, with the convergence provoked for the trade winds, cause a convection almost daily. As result, many thunderstorms are developed frequently in great areas of cloudiness, throughout this zone of convergence appear throughout the coast of the Northeast region of Brazil, in the Atlantic Ocean. (BLACKSMITH, p.115). , However not obstante of the superior thermal inversion if to find in the sphere occidental person of the subtropical anticyclone higher, the domain of this anticyclone conserves the permanence of the temperature. Practically, this constancy simply ceases with the arrival insane chains.
These courses of circulation disturbed, guilty for inconstncias and rains in the Northeast Region, involve four systems, to know: ) the insane chain system of the south; b) insane chain systems of the north; c) insane chain system of the east; d) insane chain system of the west. The Insane Chains of South are represented by inversions of polar fronts with discontinuities, deriving of the shock it enters the anticyclonic winds of the polar mass and tropical mass few times only obtains to exceed the adjacencies of the Tropic of Capricrnio during the Spring and the Summer. when they obtain makes, it throughout the littoral areas, rare exceeding the South parallel of 15 of Latitude, almost, occurring rains frontals and after-frontals to the extensive coast and leans of plateaus until the south of the Bahia.