Intertropical Convergence Zone it is sometimes referred to as a monsoon trough, a usage more common in Australia and parts of Asia. In the seamen's speech, the zone is referred to as the doldrums because of its erratic (monotonous) weather patterns with stagnant calms and violent thunderstorms. The ITCZ appears as a band of clouds, usually thunderstorms, that encircle the globe near the Equator. In the Northern Hemisphere, the trade winds move in a southwestward direction from the northeast, while in the Southern Hemisphere, they move northwestward from the southeast. When the ITCZ is positioned north or south of the Equator, these directions
2013 Atlantic hurricane season advection of cold air and water. Consequently, there was a significant cooling of sea surface temperatures over portions of the north Atlantic. This resulted in a continuation of the spring weather pattern over the Atlantic Ocean, with strong vertical wind shear, reduced mid-tropospheric moisture, and high atmospheric stability. The weak THC also resulted in slightly stronger trade winds and less wind convergence and rainfall in the Intertropical Convergence Zone, with an increase in upper-level zonal winds and higher environmental air pressures. Collectively, these factors worked to suppress tropical cyclogenesis. Tropical cyclogenesis began in early June, with the development of Tropical