Noun

Singular hurricane

Plural hurricanes

hurricane (plural hurricanes)

1. A severe tropical cyclone in the North Atlantic Ocean, Caribbean Sea, Gulf of Mexico, or in the eastern North Pacific off the west coast of Mexico, with winds of 75 miles per hour (120.7 kph) or greater accompanied by rain, lightning, and thunder that sometimes moves into temperate latitudes.
2. (meteorology) a wind scale for quite strong wind, stronger than a storm

Coordinate terms

• (type of a cyclone): cyclone, tropical storm, typhoon
• (meteorology): breeze, gale, storm

A tropical cyclone is a storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rain. Tropical cyclones feed on heat released when moist air rises, resulting in condensation of water vapor contained in the moist air. They are fueled by a different heat mechanism than other cyclonic windstorms such as nor'easters, European windstorms, and polar lows, leading to their classification as "warm core" storm systems. Tropical cyclones originate in the doldrums near the equator, about 10° away from it.

The term "tropical" refers to both the geographic origin of these systems, which form almost exclusively in tropical regions of the globe, and their formation in maritime tropical air masses. The term "cyclone" refers to such storms' cyclonic nature, with counterclockwise rotation in the Northern Hemisphere and clockwise rotation in the Southern Hemisphere. Depending on its location and strength, a tropical cyclone is referred to by many other names, such as hurricane, typhoon, tropical storm, cyclonic storm, tropical depression, and simply cyclone.

While tropical cyclones can produce extremely powerful winds and torrential rain, they are also able to produce high waves and damaging storm surge as well as spawning tornadoes. They develop over large bodies of warm water, and lose their strength if they move over land. This is why coastal regions can receive significant damage from a tropical cyclone, while inland regions are relatively safe from receiving strong winds. Heavy rains, however, can produce significant flooding inland, and storm surges can produce extensive coastal flooding up to 40 kilometres (25 mi) from the coastline. Although their effects on human populations can be devastating, tropical cyclones can also relieve drought conditions. They also carry heat and energy away from the tropics and transport it toward temperate latitudes, which makes them an important part of the global atmospheric circulation mechanism. As a result, tropical cyclones help to maintain equilibrium in the Earth's troposphere, and to maintain a relatively stable and warm temperature worldwide.

Many tropical cyclones develop when the atmospheric conditions around a weak disturbance in the atmosphere are favorable. Others form when other types of cyclones acquire tropical characteristics. Tropical systems are then moved by steering winds in the troposphere; if the conditions remain favorable, the tropical disturbance intensifies, and can even develop an eye. On the other end of the spectrum, if the conditions around the system deteriorate or the tropical cyclone makes landfall, the system weakens and eventually dissipates. It is not possible to artificially induce the dissipation of these systems with current technology.

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• Unisys Weather: Hurricane and Tropical Data
  weather.unisys.com
  Central source for a wealth of hurricane and cyclone information from around the world including enhanced satellite images, graphical maps, streaming video weather front projections, tracking graphs and charts, text-based tables of tracking information with latitude and longitude positions, maximum sustained winds in knots, and central pressure in millibars. Includes an archive of past storms.
• National Hurricane Center / Tropical Prediction Center
  nhc.noaa.gov
  Complete information on Hurricanes and Tropical Storms, including all advisories, watches and warnings.

• Hurricane and Storm Tracking
  hurricane.terrapin.com
  The latest animated plots and information on tropical storms and hurricanes in the Atlantic and Pacific Oceans.