Development of a Hurricane t he organized convection theory When a cold air mass is located above an organized cluster of tropical thunderstorms, and unstable atmosphere results. This instability leads to the development of convection. Hurricane Stages of Development Hurricanes go through a set of stages from birth to dissipation. Tropical disturbance is the beginning of a hurricane, and it has no strong winds or closed isobars around an area of low pressure containing cloudiness and some precipitation. Tropical disturbances commonly exist in the tropical trade winds at any one time.
Tropical depression is the next stage of a developing hurricane.
It has at least one closed isobar that accompanies a drop in pressure in the center of the storm. As the surface pressure begins to fall and the winds increase to between 20 and 34 knots the tropical disturbances become tropical depressions. Tropical storm is stronger than a depression as the central pressure drops, resulting in several closed isobars at the surface. Surface winds increase to speeds of 35 and 64 knots. The storm becomes more organized and the appearance begins to resemble a hurricane because of the intensifying circulation around the center of the storm.