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Tropical Cyclones Portal
is a tropical cyclone storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rainfall. Tropical cyclones feed on the heat released when moist air rises, resulting in condensation of water vapor contained in the moist air. They are fuelled 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, approximately 10 degrees away.
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 anticlockwise rotation in the Northern Hemisphere and clockwise rotation in the Southern Hemisphere. Depending on its location and intensity, a tropical cyclone can be referred to by names such as 'hurricane', 'typhoon', 'tropical storm', 'cyclonic storm', 'tropical depression', or simply 'cyclone'.
Pictured: Typhoon Tip
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The , the most intense known meteorological history of Hurricane Wilma tropical cyclone in the Western Hemisphere, began in the second week of October 2005. A large area of disturbed weather developed across much of the Caribbean Sea and gradually organized to the southeast of Jamaica. By late on October 15, the system was sufficiently organized for the National Hurricane Center to designate it as Tropical Depression Twenty-Four.
The depression drifted southwestward, and under favorable conditions, it
strengthened into Tropical Storm on Wilma October 17. Initially, development was slow due to its large size, though convection steadily organized. From October 18, and through the following day, Wilma underwent explosive deepening over the open waters of the Caribbean; in a 30-hour period, the system's central atmospheric pressure dropped from 982 mbar (29.00 inHg) to the record-low value of 882 mbar (26.05 inHg), while the winds increased to 185 mph (300 km/h). At its peak intensity, the pinhole eye of Wilma was about 3 miles (5 km) in diameter, the smallest known eye in an Atlantic hurricane. After the inner eye dissipated due to an eyewall replacement cycle, Wilma weakened to Category 4 status, and on October 21, it made landfall on Cozumel and on the Mexican mainland with winds of about 150 mph (240 km/h).
Wilma weakened over the
Yucatán Peninsula, and reached the southern Gulf of Mexico before accelerating northeastward. Despite increasing amounts of wind shear, the hurricane re-strengthened to hit Cape Romano, Florida as a major hurricane. Wilma weakened as it quickly crossed the state, and entered the Atlantic Ocean near Jupiter, Florida. The hurricane again re-intensified before cold air and wind shear penetrated the inner core of convection. On October 26, it transitioned into an extratropical cyclone, and the next day, the remnants of Wilma were absorbed by another extratropical storm over Atlantic Canada.
Hurricane Kenna — Hurricane Isabel — Hurricane Iwa — Tropical Storm Bilis – Hurricane Pauline – Browse
The map of global
tropical cyclone tracks from 1985 to 2005 includes hundreds of systems that affected over a dozen countries. This picture was made using NASA imagery and data from various meteorological agencies.
Currently active tropical cyclones
Tropical cyclone anniversaries
December 29, 1996 -
Cyclone Phil (pictured) reached its peak intensity after crossing parts of northern Australia.
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Original-content tropical cyclone articles: Requests: 1935 Haiti hurricane, 1926 Havana-Bermuda Hurricane, Typhoon Bilis (2000), more
Copyedit: Hurricane Elida (2002), Effects of Hurricane Dennis in Florida, Criticism of government response to Hurricane Katrina
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Cleanup: Hurricane Rita, Hurricane Wilma, Tropical Storm Fay (2002)
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Stubs: 1931 Belize hurricane, History of tropical cyclone-spawned tornadoes, more...
Update: Hurricane Stan and Tropical Depression Sixteen (2008)