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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Tropical Storms Amanda (left) and Cristobal (right) near their peak intensities on May 31 and June 3 respectively

Tropical Storm Amanda and Tropical Storm Cristobal were two related, consecutive tropical cyclones that affected Central America, southern Mexico, the Central United States, and Canada in late May and early June 2020. The first tropical cyclone formed in the East Pacific and was named Amanda. After crossing Central America, its remnants regenerated into a second one in the Gulf of Mexico and was named Cristobal. Amanda was the second tropical depression and the first named storm of the 2020 Pacific hurricane season, and Cristobal was the third named storm of the extremely active 2020 Atlantic hurricane season, and the earliest third named storm in the North Atlantic Ocean on record. Cristobal's regeneration date in the North Atlantic eclipsed the date set by Tropical Storm Colin in 2016, which formed on June 5. It was also the first Atlantic tropical storm formed in the month of June since Cindy in 2017, and the first June tropical cyclone to make landfall in Mexico since Danielle in 2016.

Amanda developed out of a broad area of low pressure associated with a tropical wave, which moved off the coast of Nicaragua into the Pacific on May 29. The disturbance slowly developed a more well-defined circulation, and on May 30, the system was designated as Tropical Depression Two-E after finishing tropical cyclogenesis. Originally expected not to strengthen significantly, the storm nevertheless compacted and was upgraded to Tropical Storm Amanda at 09:00 UTC the next day. Three hours later, Amanda made landfall in southeast Guatemala. Once inland, Amanda rapidly weakened and degenerated into a remnant low over the region's rough terrain. However, the system's remnants survived, crossing Central America and Mexico. (Full article...)

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The practice of using names to identify tropical cyclones goes back several centuries, with storms named after places, saints or things they hit before the formal start of naming in each basin. Examples of such names are the 1928 Okeechobee hurricane (also known as the "San Felipe II" hurricane) and the 1938 New England hurricane. The system currently in place provides identification of tropical cyclones in a brief form that is easily understood and recognized by the public. The credit for the first usage of personal names for weather systems is given to the Queensland Government Meteorologist Clement Wragge, who named tropical cyclones and anticyclones between 1887 and 1907. This system of naming fell into disuse for several years after Wragge retired, until it was revived in the latter part of World War II for the Western Pacific. Over the following decades, formal naming schemes were introduced for several tropical cyclone basins, including the North and South Atlantic, Eastern, Central, Western and Southern Pacific basins as well as the Australian region and Indian Ocean.

However, there has been controversy over the names used at various times, with names being dropped for religious and political reasons. Female names were exclusively used in the basins at various times between 1945 and 2000 and were the subject of several protests. At present tropical cyclones are officially named by one of eleven meteorological services and retain their names throughout their lifetimes. Due to the potential for longevity and multiple concurrent storms, the names reduce the confusion about what storm is being described in forecasts, watches and warnings. Names are assigned in order from predetermined lists once storms have one, three, or ten-minute sustained wind speeds of more than 65 km/h (40 mph), depending on which basin it originates in. Standards vary from basin to basin, with some tropical depressions named in the Western Pacific, while a significant amount of gale-force winds are required in the Southern Hemisphere. The names of significant tropical cyclones in the North Atlantic Ocean, Pacific Ocean and Australian region are retired from the naming lists and replaced with another name, at meetings of the World Meteorological Organization's various tropical cyclone committees. (Full article...)

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View of the eyewall of Hurricane Katrina taken on Aug. 28, 2005, as seen from an NOAA WP-3D Orion hurricane hunter aircraft before the storm made landfall on the United States Gulf Coast.

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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): Hurricane Rafael

East and Central Pacific (2024): No active systems

West Pacific (2024): No active systems

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: 22:05, 7 November 2024 (UTC)

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Tropical cyclone anniversaries

November 8

2008 - Hurricane Paloma reaches peak intensity as a Category 4 as it made landfall over Cuba.
2013 - Typhoon Haiyan (pictured) made landfall in the Philippines as an intense Category 5 super typhoon, causing catastrophic damage and more than 6,000 deaths, becoming one of the most notable tropical cyclones ever documented.

November 9

1995 - A cyclone (pictured) made landfall over Andhra Pradesh, causing widespread damage across much of the country, later spawning a rare snowstorm in Nepal. It killed 236 people along its path.

November 10

2001 - Typhoon Lingling (pictured) reached its peak intensity in the South China Sea with a central pressure of 940 hPa (mbar) to the east of Vietnam which it made landfall on soon afterwards. Lingling was responsible for about 200 deaths in Vietnam and the Philippines.
2015 - Cyclone Megh makes landfall over Yemen, and is regarded as one of the worst cyclones to strike Socotra. Megh killed 18 people and damaged about $1.9 billion.

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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 worldwide?
…that Cyclone Raquel (track pictured) travelled between the Australian and South Pacific basins between the 2014–15 and 2015–16 seasons, spanning both seasons in both basins?
…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 1Aerial image of destroyed houses in Tacloban, following Typhoon Haiyan (from Effects of tropical cyclones)
Image 22017 Atlantic hurricane season summary map (from Cyclone)
Image 3The 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 4Tropical 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 5
South-West Indian Ocean cyclone
(from Cyclone)
Image 6Comparison between extratropical and tropical cyclones on surface analysis (from Cyclone)
Image 7Flooding 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 8
Pacific typhoon
(from Cyclone)
Image 9The aftermath of Hurricane Katrina in Gulfport, Mississippi. Katrina was the costliest tropical cyclone in United States history. (from Effects of tropical cyclones)
Image 10Chart with concurrent information for Hurricane Arlene and Tropical Storm Bret logged and plotted (from Tropical cyclone preparedness)
Image 11Hurricane Isabel (2003)'s effect on the North Carolina Outer Banks (from Effects of tropical cyclones)
Image 12
Pacific hurricane
(from Cyclone)
Image 13Hurricane response involves working in hazardous conditions, including contamination and electrocution hazards from floodwater.
Image 14
North Indian Ocean cyclone
(from Cyclone)
Image 15An extratropical cyclone near Iceland (from Cyclone)
Image 16
South Pacific cyclone
(from Cyclone)
Image 17Several cyclones on the dynamic north pole of Jupiter, imaged by Juno (from Cyclone)
Image 18The aftermath of Hurricane Katrina in Gulfport, Mississippi. (from Tropical cyclone preparedness)
Image 19Subtropical Storm Alex in the north Atlantic Ocean in January 2016 (from Cyclone)
Image 20Percentages of hurricane deaths in the United States from 1970 to 1999. (from Effects of tropical cyclones)
Image 21A polar low over the Sea of Japan in December 2009 (from Cyclone)
Image 22Cyclone on Mars, imaged by the Hubble Space Telescope (from Cyclone)
Image 23All 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 24Hurricane Catarina, a rare South Atlantic tropical cyclone viewed from the International Space Station on March 26, 2004 (from Cyclone)
Image 25
Australian region cyclone
(from Cyclone)
Image 26An example of a chart for Matthew showing its five-day forecast track (from Tropical cyclone preparedness)
Image 27The 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)
Image 28A 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 29
Atlantic hurricane
(from Cyclone)
Image 30Surface weather map of the 1935 Labor Day hurricane moving up the west coast of Florida (from Tropical cyclone observation)
Image 31Personnel and equipment from the National Guard of the United States en route to Hurricane Florence response efforts in 2018
Image 32The 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 33Radar image of Hurricane Erika making landfall over Northeastern Mexico (from Tropical cyclone observation)
Image 34Broken concrete utility pole in Puerto Rico after Hurricane Maria in 2017, which ranks fourth in costliest US tropical cyclones. (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.

Approximately 500 tropical and subtropical cyclones have affected the state of Florida. More storms hit Florida than any other U.S. state, and since 1851 only eighteen hurricane seasons passed without a known storm impacting the state. Collectively, cyclones that hit the region have resulted in over 10,000 deaths, most of which occurred prior to the start of hurricane hunter flights in 1943. Additionally, the cumulative impact from the storms has totalled over US$300 billion in damage (2018 dollars), primarily from Hurricane Andrew, Hurricane Irma and Hurricane Ian in the 1992, 2017, and 2022 seasons respectively. The most recent hurricane to make landfall in Florida was Hurricane Milton in 2024. (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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