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Portal:Tropical cyclones

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Tropical cyclones portal

Satellite photograph of Typhoon Tip

A tropical cyclone is a storm system characterized by a large low-pressure center, a closed low-level circulation and a spiral arrangement of 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. Most 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, as well as to 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 may 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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Season summary map
The 2005 Atlantic hurricane season was the most active Atlantic hurricane season in recorded history, shattering previous records on repeated occasions. The impact of the season was widespread and ruinous with at least 2,048 deaths and record damages of over $100 billion USD, with the damage surpassed only by the 2017 season. The season's five landfalling major hurricanesDennis, Emily, Katrina, Rita, and Wilma—were responsible for most of the destruction. The Mexican state of Quintana Roo and the U.S. states of Florida and Louisiana were each struck twice by major hurricanes; Cuba, Mississippi, Texas, and Tamaulipas were each struck once and in each case brushed by at least one more. The most catastrophic effects of the season were felt on the United States' Gulf Coast, where a 30-foot storm surge from Hurricane Katrina caused devastating flooding that inundated New Orleans and destroyed most structures on the Mississippi coastline, and in Guatemala, where Hurricane Stan combined with an extratropical system to cause extremely deadly mudslides.

The season officially began on June 1, 2005, and lasted until November 30, 2005, although effectively the season persisted into January 2006 due to continued storm activity. A record twenty-eight tropical and subtropical storms formed, of which a record fifteen became hurricanes. Of these, seven strengthened into major hurricanes, a record-tying five became Category 4 hurricanes and a record four reached Category 5 strength, the highest categorization for hurricanes on the Saffir–Simpson hurricane scale. Among these Category 5 storms was Hurricane Wilma, the most intense hurricane ever observed in the Atlantic.

Recently featured: Hurricane KatrinaList of storms in the 2005 Atlantic hurricane seasonList of New Jersey hurricanesHurricane Claudette (2003)Browse

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Remnants of Hurricane Agnes over the Northeastern United States. Agnes dropped torrential and record-breaking rainfall, causing over $2 billion in damage (1972 USD) and more than 100 deaths. The name was later retired.

Related WikiProjects

WikiProject Tropical cyclones is the central point of coordination for Wikipedia's coverage of tropical cyclones. Feel free to help!

WikiProject Meteorology is the main center point of coordination for Wikipedia's coverage of meteorology in general.


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Currently active tropical cyclones

Italicized basins are unofficial.

North Atlantic (2019)
No active systems
East and Central Pacific (2019)
No active systems
West Pacific (2019)
No active systems
North Indian Ocean (2019)
No active systems
Mediterranean (2018–19)
No active systems
South-West Indian Ocean (2018–19)
Tropical Cyclone Kenneth
Moderate Tropical Storm Lorna
Australian region (2018–19)
Tropical Low
South Pacific (2018–19)
No active systems
South Atlantic (2018–19)
No active systems

Last updated 12:29, 24 April 2019 (UTC)

Did you know…

Hina Mar 16 1985 0319Z.png
  • …that according to an unofficial reanalyisis using the Dvorak technique, Cyclone Hina (pictured) had a peak intensity of 170 kt (195 mph, 315 km/h)?
Onil 02 oct 2004 0928Z.jpg

Tropical cyclone anniversaries

Monica 2006-04-24 0139Z.jpg

April 23,

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April 24,

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April 25,

  • 1986 - As a small cyclone, Cyclone Manu (pictured) attained peak intensity as a weak Category 1 tropical cyclone, before nearing the shores of Queensland.
  • 2005 - Typhoon Sonca reached its peak intensty with a central pressure of 928 hPa (mbar) to the east of the Philippines.

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