Most hurricanes—about two-thirds—form between 10 and 20 degrees north latitude, along a constant feature called the Intertropical Convergence Zone, or ITCZ. This zone marks the area where northeasterly breezes meet southeasterly trade winds, causing the warm, humid tropical air to rise. As the air rises, it naturally condenses into clouds and rain, which often gather into groups of thunderstorms and move along the ITCZ from east to west.
