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Definition
A tropical cyclone is the last stage of a storm, right after the tropical storm, and is equivalent to a hurricane. It is defined by winds above 74 miles per hour. The eye in the center of the cyclone is 5 to 40 miles wide and is surrounded by the eye wall. The rest of the storm spins around the eye in ever greater circles outward. The typical width is 300 miles for the whole storm.
Weather Conditions
The summer and early fall months prove to be the most likely to produce tropical cyclones due to the fact that the water is warmed above 80 degrees Fahrenheit during those months, especially near the equator. As the water warms, it evaporates much more quickly. Minor storms passing through the region develop into much stronger and more powerful storms as they absorb the additional moisture.
Wind
Wind is another crucial factor in the formation of tropical cyclones. Low pressure systems in the tropics cause wind to converge around a central location. As the trade winds go from east to west they hit the convergence and begin to rapidly spin the air. If there is a large storm passing through at the same time, a tropical cyclone could begin to form.
Expansion
As evaporation turns back into liquid, stored heat is expelled into the atmosphere. With the increased heat, the air within the storm becomes less dense and rises thousands of feet into the air. This process repeats over and over again, with each cycle causing a new one to occur, each time creating thicker clouds overhead. Finally, the storm reaches its full fury and begins to dump rain down as it makes landfall.