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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Satellite image of the hurricane on September 9, 1971

Hurricane Edith was the strongest hurricane to form during the 1971 Atlantic hurricane season and the southernmost landfalling Category 5 hurricane on record in the Atlantic at the time. Edith developed from a tropical wave on September 5 and quickly strengthened into a hurricane in the Caribbean Sea. Edith rapidly intensified on September 9 and made landfall on Cape Gracias a Dios as a Category 5 hurricane on the Saffir-Simpson Hurricane Scale. Being a category 5 hurricane, Edith peaked at only 943 mbar (hPa), making Edith the least intense category 5 Atlantic hurricane on record. It quickly lost intensity over Central America and after briefly entering the Gulf of Honduras it crossed the Yucatán Peninsula in Mexico. After moving across the Gulf of Mexico a trough turned the storm to the northeast and Edith, after having restrengthened while accelerating towards the coast, made landfall on Louisiana with winds of 105 mph (169 km/h) on September 16. Edith steadily weakened over land and dissipated over Georgia on September 18.

The hurricane killed two people when it passed near Aruba. Striking northeastern Central America as a Category 5 hurricane, Edith destroyed hundreds of homes and killed at least 35 people. In Texas high tides caused coastal flooding but little damage. Edith caused moderate to heavy damage in portions of Louisiana due to flooding and a tornado outbreak from the storm. One tornado, rated F3 on the Fujita Scale, damaged several homes and injured multiple people in Baton Rouge. The tornado outbreak extended eastward into Florida, of which a few destroyed entire buildings. Damage in the United States totaled US$25 million (1971 USD, $188 million 2022 USD). (Full article...)

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Hurricane Warning Offices and their areas of responsibility, c. 1959

The history of Atlantic tropical cyclone warnings details the progress of tropical cyclone warnings in the North Atlantic Ocean. The first service was set up in the 1870s from Cuba with the work of Father Benito Viñes. After his death, hurricane warning services were assumed by the US Army Signal Corps and United States Weather Bureau over the next few decades, first based in Jamaica and Cuba before shifting to Washington, D.C. The central office in Washington, which would evolve into the National Meteorological Center and the Weather Prediction Center, assumed the responsibilities by the early 20th century. This responsibility passed to regional hurricane offices in 1935, and the concept of the Atlantic hurricane season was established to keep a vigilant lookout for tropical cyclones during certain times of the year. Hurricane advisories issued every 12 hours by the regional hurricane offices began at this time.

The National Hurricane Center became a tropical cyclone warning center in 1956 and assumed many of the functions it has today by 1965. The National Hurricane Research Project, begun in the 1950s, used aircraft to study tropical cyclones and carry out experiments on mature hurricanes through its Stormfury project. Forecasts within the hurricane advisories were issued one day into the future in 1954 before being extended to two days into the future in 1961, three days into the future in 1964, and five days into the future in 2001. From the 1960s through the 1980s, work from the various regional hurricane offices was consolidated into the National Hurricane Center. Its name was changed to the Tropical Prediction Center in 1995, before reassuming its National Hurricane Center name in 2010. Tropical cyclone forecasting is done nowadays using statistical methods based on tropical cyclone climatology, as well as methods of numerical weather prediction where computers use mathematical equations of motion to determine their movement. (Full article...)

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Cyclone Inigo near peak intensity, as a Category 5 severe tropical cyclone on the Australian region scale, with 10-minute sustained winds of 150 miles per hour (240 km/h) and 1-minute sustained winds of 160 miles per hour (260 km/h). This image was taken from by one of NASA's EOSDIS satellites on April 4, 2003, while the cyclone was to the south of Indonesia.

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The 2018 Atlantic hurricane season was the third in a consecutive series of above-average and damaging Atlantic hurricane seasons, featuring 15 named storms, 8 hurricanes, and 2 major hurricanes, which caused a total of over $50 billion (2018 USD) in damages and at least 172 deaths. More than 98% of the total damage was caused by two hurricanes (Florence and Michael). The season officially began on June 1, 2018, and ended on November 30, 2018. These dates historically describe the period in each year when most tropical cyclones form in the Atlantic basin and are adopted by convention. However, subtropical or tropical cyclogenesis is possible at any time of the year, as demonstrated by the formation of Tropical Storm Alberto on May 25, making this the fourth consecutive year in which a storm developed before the official start of the season. The season concluded with Oscar transitioning into an extratropical cyclone on October 31, almost a month before the official end.

Although several tropical cyclones impacted land, only a few left extensive damage. In mid-September, Hurricane Florence produced disastrous flooding in North Carolina and South Carolina, with damage totaling about $24 billion. The storm also caused 54 deaths. About a month later, Hurricane Michael, the first tropical cyclone to strike the United States as a Category 5 hurricane since Hurricane Andrew in 1992, left extensive damage in Florida, Georgia, and Alabama. Michael caused approximately $25 billion in damage and at least 64 deaths. Since Michael reached Category 5 status, 2018 became the third consecutive season to feature at least one Category 5 hurricane. Hurricane Leslie resulted in the first tropical storm warning being issued for the Madeira region of Portugal. Leslie and its remnants left hundreds of thousands of power outages and downed at least 1,000 trees in the Portuguese mainland, while heavy rains generated by the remains of the cyclone caused 15 deaths in France. The storm left approximately $500 million in damage and 16 fatalities. (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): No active systems

North Indian Ocean (2024): No active systems

Mediterranean (2023–24): No active systems

South-West Indian Ocean (2023–24): No active systems

Australian region (2023–24): No active systems

South Pacific (2023–24): No active systems

South Atlantic (2023–24): No active systems

Last updated: 21:54, 8 May 2024 (UTC)

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Tropical cyclone anniversaries

May 18

1986 - Cyclone Namu moved through the Solomon Islands, killing at least 111 people.
1997 - A powerful cyclone made landfall over in Bangladesh as a powerful Category 4 cyclone, killing more than 1,150 people.
2020 - Cyclone Amphan (pictured) reached peak intensity as a Category 5 super cyclonic storm, and two days later moved ashore near the border of India and Bangladesh. With an estimated US$13.7 billion in damages, Amphan was the costliest North Indian Ocean tropical cyclone on record.

May 19

1997 - A powerful cyclone (pictured) struck Bangladesh, killing 1,146 people.
2004 - A cyclone made landfall in Burma, causing floods and resulting in 236 fatalities.
2018 - Cyclone Sagar moved ashore Somaliland, with its associated floods killing 79 people across the region.

May 20

1989 - Typhoon Brenda makes landfall over Southern China as a Category 1 typhoon, killing about 84 people.
1999 - A powerful cyclone (pictured) struck southeastern Pakistan, killing at least 400 people, and perhaps as many as 6,000.
2005 - Tropical Depression Adrian became the first Pacific tropical cyclone to strike the Pacific coast of Honduras.

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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 Hurricane Agatha (pictured) was the strongest Pacific hurricane to make landfall in Mexico in May since records began in 1949?
…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 Cyclone Amphan (pictured) in 2020 was the first storm to be classified as a Super Cyclonic Storm in the Bay of Bengal since 1999?

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 2Tropical 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 3
Pacific hurricane
(from Cyclone)
Image 4
Australian region cyclone
(from Cyclone)
Image 5Surface weather map of the 1935 Labor Day hurricane moving up the west coast of Florida (from Tropical cyclone observation)
Image 6The aftermath of Hurricane Katrina in Gulfport, Mississippi. Katrina was the costliest tropical cyclone in United States history. (from Effects of tropical cyclones)
Image 7
Pacific typhoon
(from Cyclone)
Image 8Chart with concurrent information for Hurricane Arlene and Tropical Storm Bret logged and plotted (from Tropical cyclone preparedness)
Image 9Radar image of Hurricane Erika making landfall over Northeastern Mexico (from Tropical cyclone observation)
Image 10The aftermath of Hurricane Katrina in Gulfport, Mississippi. (from Tropical cyclone preparedness)
Image 11
South Pacific cyclone
(from Cyclone)
Image 12The 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 13A polar low over the Sea of Japan in December 2009 (from Cyclone)
Image 14An example of a chart for Matthew showing its five-day forecast track (from Tropical cyclone preparedness)
Image 15Aerial image of destroyed houses in Tacloban, following Typhoon Haiyan (from Effects of tropical cyclones)
Image 16Hurricane response involves working in hazardous conditions, including contamination and electrocution hazards from floodwater.
Image 17Personnel and equipment from the National Guard of the United States en route to Hurricane Florence response efforts in 2018
Image 18Hurricane Catarina, a rare South Atlantic tropical cyclone viewed from the International Space Station on March 26, 2004 (from Cyclone)
Image 19All 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 20Hurricane Isabel (2003)'s effect on the North Carolina Outer Banks (from Effects of tropical cyclones)
Image 21Subtropical Storm Alex in the north Atlantic Ocean in January 2016 (from Cyclone)
Image 22
South-West Indian Ocean cyclone
(from Cyclone)
Image 23Broken 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 24A 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 25An extratropical cyclone near Iceland (from Cyclone)
Image 26Comparison between extratropical and tropical cyclones on surface analysis (from Cyclone)
Image 27Percentages of hurricane deaths in the United States from 1970 to 1999. (from Effects of tropical cyclones)
Image 28Flooding 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 29The 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 30Cyclone on Mars, imaged by the Hubble Space Telescope (from Cyclone)
Image 31The 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 32
North Indian Ocean cyclone
(from Cyclone)
Image 33
Atlantic hurricane
(from Cyclone)

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

The 1992 Atlantic hurricane season was among the least active of any Atlantic hurricane season on record. It produced six named tropical cyclones. The season officially started on June 1, 1992, and ended on November 30. These dates, adopted by convention, historically delimit the period each year when most Atlantic tropical systems form. However, storm formation is possible at any time of the year, as was the case this season, when Subtropical Storm One formed on April 21. This timeline documents all the storm formations, strengthening, weakening, landfalls, extratropical transitions, as well as dissipations during the season.

During the year, three tropical depressions, one subtropical storm, two tropical storms, and four hurricanes formed. It produced seven storms, less than the average of ten usually formed throughout an Atlantic hurricane season, while four of the storms went on to become hurricanes. The first cyclone to form inside the official season was Tropical Depression One, which formed on June 25. Of the four hurricanes, Hurricane Andrew was the most intense, reaching Category 5 status. In late June, Tropical Depression One caused severe flooding in southwestern Florida and Cuba; heavy rainfall was recorded in Pinar del Río, Matanzas, and Havana. When Andrew struck Florida and Louisiana in August, it became the second-costliest hurricane to hit the United States. Damages were estimated to be about $26.5 billion and 68 people were killed. Tropical Storm Danielle made landfall at the Delmarva Peninsula on the Virginian coast on September 25, causing minimal flooding. There was one recorded death recorded due to Danielle; a ship east of New Jersey was sunk due to rough seas. The season finished on October 30 when Hurricane Frances became an extratropical gale before dissipating. (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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