Inter-tropical convergence zone – ITCZ

The Intertropical Convergence Zone (ITCZ) is an area of low pressure that forms due to  the action of the Hadley Cell, where the Northeast Trade Winds meet the Southeast  Trade Winds near the Earth’s equator. As these winds converge, moist air is forced upward.  This causes water vapour to condense, or be “squeezed” out, as the air cools and rises, resulting in a band of heavy precipitation around the globe. This band moves seasonally, always being drawn toward the area of most intense solar heating, or warmest surface  temperatures.