Uneven warming shifts equatorial rain band, midlatitude westerlies



In a band near the equator, southward Northern Hemisphere winds and northward Southern Hemisphere winds come together to form the Intertropical Convergence Zone (ITCZ). In this zone the equatorward winds rise and cool, creating a region of high precipitation and weak surface winds. The ITCZ's location and the precipitation it delivers to the rainforests are not static—seasonal differences in temperature between the hemispheres drive ITCZ north and south, with the convergence zone moving toward the warmer hemisphere.