The global wind pattern is also known as the "general circulation" and the surface winds of each hemisphere are divided into three wind belts:

• Polar Easterlies: From 60-90 degrees latitude.
• Prevailing Westerlies: From 30-60 degrees latitude (aka Westerlies).
• Tropical Easterlies: From 0-30 degrees latitude (aka Trade Winds).

The easterly trade winds of both hemispheres converge at an area near the equator called the "Intertropical Convergence Zone (ITCZ)", producing a narrow band of clouds and thunderstorms that encircle portions of the globe.