Image:Animated hurricane.gif

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A sequence of Doppler radar images of a hurricane near the United States.

ɦSourced from http://www.aoml.noaa.gov/hrd/tcfaq/graphics/animehurr.gif

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In meteorology, a tropical cyclone is a storm system with a closed circulation around a center of low pressure, driven by heat energy released as moist air drawn in over warm ocean waters rises and condenses. The name underscores their origin in the tropics and their cyclonic nature. They are distinguished from other cyclonic storms, such as extratropical storms (such as nor'easters) and polar lows by the heat mechanism that fuels them.

Depending on their strength and location, a tropical cyclone can be called a tropical depression, tropical storm, hurricane, or typhoon, among other names.

They can carry extremely high winds, tornadoes, torrential rain, and storm surge onto coasts, leading to mudslides and flash floods in addition to wind damage. Though the effects on populations and ships can be catastrophic, tropical cyclones carry away heat that builds up in the tropics, and have been known to relieve and end droughts in areas they impact. They are a part of the larger atmospheric circulation that maintains equilibrium in the environment.

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