Hurricanes

hurricane

The Hurricane is the North Atlantic and eastern Pacific name for a synoptic scale tropical cyclone of a very specific intensity. The threshold for a storm to achieve the hurricane status is a maximum sustained wind of 74mph, usually found at the storm core.
At the center of a hurricane is the eye, an area of tranquility within the maelstrom surrounding it. Just outside of the eye is the eye wall, which is formed by counterclockwise rotating winds and is home to the strongest winds of the system. Counterclockwise winds extend out, at weakening velocities from the eye wall to the outer periphery of the system. The low pressure at the center of the hurricane draws in bands of showers and storms, called feeder bands, which can extend hundreds of miles from the primary circulation. The counterclockwise winds can produce bands of thunderstorms rotating around the center of the system, called spiral bands.
For development, one of the primary ingredients must be warm ocean waters, while light shear aloft, cold air aloft and a preexisting trigger, such as a tropical wave, are additional components to the development of a system. Because of the warm water component, the primary regions for development are near, but not along the equator, as Coriolis is a component to getting the systems to spin. To generate the trigger, there needs to be some sort of conflict in air mass, so the center of the Pacific is not conducive to the development of storms, but the eastern and western Pacific, Indian and north Atlantic Oceans are the most favorable locations for tropical storms.
The north Atlantic hurricane season extends from June through early November, when the North Atlantic and Caribbean are at their warmest. The most favorable regions for landfall in the United States are Florida and the eastern Carolinas, because of their projection into the Atlantic, exposed to the passing storms.
Aside from rain and thunderstorms (some with tornadoes) another threat is storm surge, which is generated by the inherent strong winds associated with a hurricane, which force water ahead of the system towards shore, and would lead to coastal flooding.

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