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Coriolis Effect
In high-pressure areas, winds are moving downward and outward. In low-pressure areas, the air moves inward and upward. Both of these sensations occur because the air is trying to equal the pressure out and reach an equilibrium. Add this to the rotation of the Earth and the air pressure begins to move in a circular motion known as the Coriolis effect.
Hadley Cell
The Hadley Cell is a location near the Equator that include the intertropical convergence zone and the subtropical high-pressure zone. The intertropical convergence zone is at or near the equator and is a low-pressure zone where air is moving inward and upward. The subtropical high pressure zone is 30 degrees north and suth of the equator, and the air is moving downward and inward. The Hadley Cell makes up the area where these two pressure masses meet.
Thunderstorm Development
Heat and solar energy cause a lot of water to evaporate. With the low-pressure zone pushing wind up, this moisture collides with the high-pressure zone moving down and thunderstorms develop. Hurricanes are powered by heat energy. The thunderstorms are energized by solar energy and heat, and as the warm water continues to evaporate the thunderstorms start to gain power.
Cyclonic Movement
As they gain power and heat, the thunderstorms begin to organize themselves into a band that begins to move in circles around the center. As more water evaporates from the storms, they continue to get stronger. Winds increase, bringing in more heat and adding to the power of the storm. The storm can be categorized as a hurricane once it reaches 74 mph.