Portal:Tropical cyclones

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The Tropical Cyclones Portal

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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 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. Most tropical cyclones originate in the doldrums, approximately ten degrees from the Equator.

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".

Types of cyclone: 1. A "Typhoon" is a tropical cyclone located in the North-west Pacific Ocean which has the most cyclonic activity and storms occur year-round. 2. A "Hurricane" is also a tropical cyclone located at the North Atlantic Ocean or North-east Pacific Ocean which have an average storm activity and storms typically form between May 15 and November 30. 3. A "Cyclone" is a tropical cyclone that occurs in the South Pacific and Indian Oceans.

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Harvey near its peak intensity prior to landfall in southern Texas late on August 25

Hurricane Harvey was a devastating tropical cyclone that made landfall on Texas and Louisiana in August 2017, causing catastrophic flooding and more than 100 deaths. It is tied with 2005's Hurricane Katrina as the costliest tropical cyclone on record, inflicting $125 billion (2017 USD) in damage, primarily from catastrophic rainfall-triggered flooding in Greater Houston and Southeast Texas; this made the storm the costliest natural disaster recorded in Texas at the time. It was the first major hurricane to make landfall in the United States since Wilma in 2005, ending a record 12-year span in which no hurricanes made landfall at the intensity of a major hurricane throughout the country. In a four-day period, many areas received more than 40 inches (1,000 mm) of rain as the system slowly meandered over eastern Texas and adjacent waters, causing unprecedented flooding. With peak accumulations of 60.58 in (1,539 mm), in Nederland, Texas, Harvey was the wettest tropical cyclone on record in the United States. The resulting floods inundated hundreds of thousands of homes, which displaced more than 30,000 people and prompted more than 17,000 rescues.

The eighth named storm, third hurricane, and first major hurricane of the extremely active 2017 Atlantic hurricane season, Harvey developed from a tropical wave to the east of the Lesser Antilles, reaching tropical storm status on August 17. The storm crossed through the Windward Islands on the following day, making landfall on the southern end of Barbados and a second landfall on Saint Vincent. Upon entering the Caribbean, Harvey began to weaken due to moderate wind shear, and degenerated into a tropical wave north of Colombia, late on August 19. The remnants were monitored for regeneration as it continued west-northwestward across the Caribbean and the Yucatán Peninsula, before redeveloping over the Bay of Campeche on August 23. Harvey then began to rapidly intensify on August 24, regaining tropical storm status and becoming a hurricane later that day. (Full article...)

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Track of Hurricane Ivan, according to the Saffir-Simpson scale

The meteorological history of Hurricane Ivan, the longest tracked tropical cyclone of the 2004 Atlantic hurricane season, lasted from late August through late September. The hurricane developed from a tropical wave that moved off the coast of Africa on August 31. Tracking westward due to a ridge, favorable conditions allowed it to develop into Tropical Depression Nine on September 2 in the deep tropical Atlantic Ocean. The cyclone gradually intensified until September 5, when it underwent rapid deepening and reached Category 4 status on the Saffir-Simpson Hurricane Scale; at the time Ivan was the southernmost major North Atlantic hurricane on record.

Ivan quickly weakened due to dry air, but it gradually reorganized, passing just south of Grenada as a major hurricane on September 7. The hurricane attained Category 5 status in the central Caribbean Sea. Over the subsequent days its intensity fluctuated largely due to eyewall replacement cycles, and Ivan passed just south of Jamaica, the Cayman Islands, and western Cuba with winds at or slightly below Category 5 status. Turning northward and encountering unfavorable conditions, Ivan gradually weakened before making landfall just west of Gulf Shores, Alabama on September 16 with winds of 120 mph (190 km/h). The cyclone quickly weakened to tropical depression status as it turned to the northeast, and Ivan transitioned into an extratropical cyclone on September 18. (Full article...)

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The MODIS instrument onboard NASA's Terra satellite captured this true-color image of Tropical Cyclone Gafilo churning in the waters northwest of Madagascar on March 6, 2004. At the time this image was taken, Gafilo has sustained winds of approximately 160 mph. Cyclone warnings had been posted for all of northwestern Madagascar.

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The 2007 Atlantic hurricane season was the first season since 2003 to feature tropical activity both before and after the official bounds of the season. There were an above-average number of named storms during the season – 15, however many storms were weak and short-lived. Despite the predominance of weak systems, this was the first season on record to feature more than one Category 5 landfalling hurricane. This would not happen again until 2017. It produced 17 tropical cyclones, 15 tropical storms, six hurricanes, and two major hurricanes. It officially started on June 1 and ended on November 30, dates which conventionally delimit the period during which most tropical cyclones form in the Atlantic Ocean, although as shown by Subtropical Storm Andrea and Tropical Storm Olga in early May and early December, respectively, the formation of tropical cyclones is possible at any time of the year. The first system, Subtropical Storm Andrea, developed on May 9, while the last storm, Tropical Storm Olga, dissipated on December 13. The most intense hurricane, Dean, was, at the time, the third most intense landfalling Atlantic storm on record. It was the second on record in which an Atlantic hurricane, Felix, and an eastern Pacific hurricane, Henriette, made landfall on the same day. September had a then record-tying eight storms, until it was surpassed in 2020. However, the strengths and durations of most of the storms were low.

Pre-season forecasts by Colorado State University called for 14 named storms and 7 hurricanes, of which three were expected to attain major hurricane status. The National Oceanic and Atmospheric Administration (NOAA) later issued its initial forecast, which predicted 13 to 17 named storms, 7 to 10 hurricanes and three to five major hurricanes. After several revisions in the projected number of storms, NOAA and CSU lowered their forecasts by the middle of the season. (Full article...)

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Currently active tropical cyclones

Italicized basins are unofficial.

North Atlantic (2024): No active systems

East and Central Pacific (2024): No active systems

West Pacific (2024): Tropical depression 28W

North Indian Ocean (2024): No active systems

Mediterranean (2024–25): No active systems

South-West Indian Ocean (2024–25): No active systems

Australian region (2024–25): No active systems

South Pacific (2024–25): No active systems

South Atlantic (2024–25): No active systems

Last updated: 16:12, 22 December 2024 (UTC)

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Tropical cyclone anniversaries

December 27, 2004 - Cyclone Chambo (pictured) reached its peak intensity with 155 km/h (100 mph) winds in the open Indian Ocean.

December 28

1997 - Cyclone Sid makes landfall over in the northern portion of the Northern Territory, just a day before weakening into a low-pressure area.
2002 - Cyclone Zoe (pictured) reached its peak intensity with a central pressure of 890 hPa (mbar), becoming the most intense tropical cyclone ever recorded in the Southern Hemisphere.

December 29

1996 - Cyclone Phil reached its peak intensity after crossing parts of northern Australia.
2014 - Tropical Storm Jangmi (pictured) makes landfall over in Mindanao, Philippines. Jangmi killed 66 people in total and caused Php1.2 billion (US$28.3 million) worth of damages.

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Did you know…

…that the Joint Typhoon Warning Center considers that Typhoon Vera (pictured) of 1986 is actually two distinct systems, formed from two separated low-level circulations?
…that Cyclone Freddy (track pictured) in 2023 was the longest-lasting tropical cyclone recorded?
…that the typhoons of 2024—Yinxing, Toraji, Usagi, and Man-yi (pictured)—made history as the first recorded instance since 1951 of four tropical cyclones coexisting in November?
…that Hurricane Otis (pictured) in 2023 was the first Pacific hurricane to make landfall at Category 5 intensity and surpassed Hurricane Patricia as the strongest landfalling Pacific hurricane on record?

Did you know archive

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The following are images from various tropical cyclone-related articles on Wikipedia.

Image 12017 Atlantic hurricane season summary map (from Cyclone)
Image 2Radar image of Hurricane Erika making landfall over Northeastern Mexico (from Tropical cyclone observation)
Image 3Percentages of hurricane deaths in the United States from 1970 to 1999. (from Effects of tropical cyclones)
Image 4
South-West Indian Ocean cyclone
(from Cyclone)
Image 5Hurricane Isabel (2003)'s effect on the North Carolina Outer Banks (from Effects of tropical cyclones)
Image 6The dangerous semicircle is the upper-right corner, with the arrow marking the direction of motion of a Northern Hemisphere storm. Note that typhoons, etc. are asymmetrical, and semicircle is a convenient misnomer. (from Effects of tropical cyclones)
Image 7The initial extratropical low-pressure area forms at the location of the red dot on the image. It is usually perpendicular (at a right angle to) the leaf-like cloud formation seen on satellite during the early stage of cyclogenesis. The location of the axis of the upper level jet stream is in light blue. (from Cyclone)
Image 8Aerial image of destroyed houses in Tacloban, following Typhoon Haiyan (from Effects of tropical cyclones)
Image 9An extratropical cyclone near Iceland (from Cyclone)
Image 10The aftermath of Hurricane Katrina in Gulfport, Mississippi. (from Tropical cyclone preparedness)
Image 11All but the most expensive bottles of water were sold out at this Publix supermarket before Hurricane Irma; in the week preceding the storm, water sold out soon after shipments arrived (from Tropical cyclone preparedness)
Image 12
North Indian Ocean cyclone
(from Cyclone)
Image 13An example of a chart for Matthew showing its five-day forecast track (from Tropical cyclone preparedness)
Image 14Chart with concurrent information for Hurricane Arlene and Tropical Storm Bret logged and plotted (from Tropical cyclone preparedness)
Image 15Tropical cyclones form when the energy released by the condensation of moisture in rising air causes a positive feedback loop over warm ocean waters. (from Cyclone)
Image 16
Australian region cyclone
(from Cyclone)
Image 17Hurricane response involves working in hazardous conditions, including contamination and electrocution hazards from floodwater.
Image 18A fictitious synoptic chart of an extratropical cyclone affecting the UK and Ireland. The blue arrows between isobars indicate the direction of the wind, while the "L" symbol denotes the centre of the "low". Note the occluded, cold and warm frontal boundaries. (from Cyclone)
Image 19Cyclone on Mars, imaged by the Hubble Space Telescope (from Cyclone)
Image 20Broken concrete utility pole in Puerto Rico after Hurricane Maria in 2017, which ranks fourth in costliest US tropical cyclones. (from Effects of tropical cyclones)
Image 21Personnel and equipment from the National Guard of the United States en route to Hurricane Florence response efforts in 2018
Image 22Comparison between extratropical and tropical cyclones on surface analysis (from Cyclone)
Image 23A polar low over the Sea of Japan in December 2009 (from Cyclone)
Image 24
Atlantic hurricane
(from Cyclone)
Image 25Hurricane Catarina, a rare South Atlantic tropical cyclone viewed from the International Space Station on March 26, 2004 (from Cyclone)
Image 26The aftermath of Hurricane Katrina in Gulfport, Mississippi. Katrina was the costliest tropical cyclone in United States history. (from Effects of tropical cyclones)
Image 27
Pacific typhoon
(from Cyclone)
Image 28
Pacific hurricane
(from Cyclone)
Image 29Surface weather map of the 1935 Labor Day hurricane moving up the west coast of Florida (from Tropical cyclone observation)
Image 30Several cyclones on the dynamic north pole of Jupiter, imaged by Juno (from Cyclone)
Image 31Subtropical Storm Alex in the north Atlantic Ocean in January 2016 (from Cyclone)
Image 32Flooding in Port Arthur, Texas caused by Hurricane Harvey. Harvey was the wettest and second-costliest tropical cyclone in United States history. (from Effects of tropical cyclones)
Image 33
South Pacific cyclone
(from Cyclone)
Image 34The number of $1 billion Atlantic hurricanes almost doubled from the 1980s to the 2010s, and inflation-adjusted costs have increased more than elevenfold. The increases have been attributed to climate change and to greater numbers of people moving to coastal areas. (from Effects of tropical cyclones)

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This is a featured list, which represents some of the best list articles on English Wikipedia.

The list of North Carolina hurricanes before 1900 encompasses 139 tropical cyclones that affected the U.S. state of North Carolina. Collectively, cyclones in North Carolina during the time period resulted in over 775 direct fatalities during the period. Seven cyclones affected the state in the 1893 season, which was the year with the most tropical cyclones impacting the state during the time period. From the beginning of the official North Atlantic hurricane record in 1851 to 1899, there were 12 years without a known tropical cyclone affecting the state. The strongest hurricane to hit the state during the official record was the San Ciriaco hurricane of 1899, which struck the state with winds of 120 mph (195 km/h), although the 1821 Norfolk and Long Island Hurricane may have been stronger.

Historical data prior to 1700 is sparse due to lack of significant European settlements along the coastline; the few storms listed are largely records from Roanoke Colony and later the Province of Carolina. Modern meteorologists believe early storms were tropical cyclones, though due to the time period confirmation is impossible. One theory explaining the disappearance of Roanoke Colony suggests a hurricane destroyed the village, though there is no evidence to prove the theory. It is considered unlikely due to lack of damage to a fence around the village, on which the villagers left an inscription. (Full article...)

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Related WikiProjects

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

WikiProject Weather is the main center point of coordination for Wikipedia's coverage of meteorology in general, and the parent project of WikiProject Tropical cyclones. Three other branches of WikiProject Weather in particular share significant overlaps with WikiProject Tropical cyclones:

The Non-tropical storms task force coordinates most of Wikipedia's coverage on extratropical cyclones, which tropical cyclones often transition into near the end of their lifespan.
The Floods task force takes on the scope of flooding events all over the world, with rainfall from tropical cyclones a significant factor in many of them.
WikiProject Severe weather documents the effects of extreme weather such as tornadoes, which landfalling tropical cyclones can produce.

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