The inter-zone convergence has not always been in his current position, but has undergone a shift northward documented geological sediment from the equatorial zone and inter.

The climate of the area has undergone major changes in recent times, a testimony of an evolution, and especially coinciding with the phases known climatic history of the planet.

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During Global warming we find this huge cloud to lower latitudes during the winter and north during warm months.

The origin of this convection is twofold: the abundant sunshine equatorial zone which provides a large amount of heat to lower layers and meeting between the trade winds from the north east of the northern hemisphere and those coming from the south west south dall'emisfero but diverted to the passage of equator for the change of sign of the Coriolis force, ie the direct consequence of the rotation of the earth around its axis, which requires a detour to the right to all movements along the longitude on the planet.

This band of convection is particularly important because it is through these powerful vertical motion that takes much of the redistribution of heat in the air.

Even more crucial are the effects of aging in this cloud, which translates into very strong rain can give plenty of fresh water to areas of the affected area. Therefore obvious that in the medium and long term variations in the variations of the north-south oscillations of the convection zone or latitude of movement of the mechanism is particularly important for the climatic conditions of the area and, given the importance of the phenomenon, for latitudes extratropicali, with particular reference all'emisfero North.