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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Hurricane Iniki at peak intensity south of Kauaʻi on September 11

Hurricane Iniki (/iːˈniːkiː/ ee-NEE-kee; Hawaiian: ʻiniki meaning "strong and piercing wind") was a hurricane that struck the island of Kauaʻi on September 11, 1992. It was the most powerful hurricane to strike Hawaiʻi in recorded history, and the only hurricane to directly affect the state during the 1992 Pacific hurricane season. Forming on September 5, 1992, during the strong 1990–1995 El Niño, Iniki was one of eleven Central Pacific tropical cyclones during that season. It attained tropical storm status on September 8 and intensified into a hurricane the next day. After abruptly turning north, Iniki struck Kauaʻi at peak intensity; it had winds of 145 mph and reached Category 4 status on the Saffir–Simpson hurricane scale.

Winds gusted to 225 mph (362 km/h). It was the first hurricane to hit the state since Hurricane Iwa in the 1982 season, and the only known major hurricane to hit the state. Iniki dissipated on September 13, about halfway between Hawaii and Alaska. (Full article...)

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Satellite imagery of Cyclone Ianos, a powerful Mediterranean tropical-like cyclone that impacted Greece on 17 September 2020.

Mediterranean tropical-like cyclones, often referred to as Mediterranean cyclones or Mediterranean hurricanes, and shortened as medicanes, are meteorological phenomena occasionally observed over the Mediterranean Sea. On a few rare occasions, some storms have been observed reaching the strength of a Category 1 hurricane, on the Saffir–Simpson scale, and Cyclone Ianos in 2020 was recorded reaching Category 2 intensity. The main societal hazard posed by medicanes is not usually from destructive winds, but through life-threatening torrential rains and flash floods.

The occurrence of medicanes has been described as not particularly rare. Tropical-like systems were first identified in the Mediterranean basin in the 1980s, when widespread satellite coverage showing tropical-looking low pressures which formed a cyclonic eye in the center were identified. Due to the dry nature of the Mediterranean region, the formation of tropical, subtropical cyclones and tropical-like cyclones is infrequent and also hard to detect, in particular with the reanalysis of past data. Depending on the search algorithms used, different long-term surveys of satellite era and pre-satellite era data came up with 67 tropical-like cyclones of tropical storm intensity or higher between 1947 and 2014, and around 100 recorded tropical-like storms between 1947 and 2011. More consensus exists about the long term temporal and spatial distribution of tropical-like cyclones: they form predominantly over the western and central Mediterranean Sea while the area east of Crete is almost devoid of tropical-like cyclones. The development of tropical-like cyclones can occur year-round, with activity historically peaking between the months of September and January, while the counts for the summer months of June and July are the lowest, being within the peak dry season of the Mediterranean with stable air. (Full article...)

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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.

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The 2020 Atlantic hurricane season was the most active Atlantic hurricane season on record, in terms of number of systems. It featured a total of 31 tropical or subtropical cyclones, with all but one cyclone becoming a named storm. Of the 30 named storms, 14 developed into hurricanes, and a record-tying seven further intensified into major hurricanes. It was the second and final season to use the Greek letter storm naming system, the first being 2005, the previous record. Of the 30 named storms, 11 of them made landfall in the contiguous United States, breaking the record of nine set in 1916. During the season, 27 tropical storms established a new record for earliest formation date by storm number. This season also featured a record ten tropical cyclones that underwent rapid intensification, tying it with 1995, as well as tying the record for most Category 4 hurricanes in a singular season in the Atlantic Basin. This unprecedented activity was fueled by a La Niña that developed in the summer months of 2020, continuing a stretch of above-average seasonal activity that began in 2016. Despite the record-high activity, this was the first season since 2015 in which no Category 5 hurricanes formed.

The season officially started on June 1 and officially ended on November 30. However, tropical cyclogenesis is possible at any time of the year, as demonstrated by the early formation of Tropical Storms Arthur and Bertha, on May 16 and 27, respectively. This was the sixth consecutive year with a pre-season system and the second of these seasons to have two, with the other being 2016. The first hurricane, Hurricane Hanna, made landfall in Texas on July 25. Hurricane Isaias formed on July 31, and made landfall in The Bahamas and North Carolina in early August, both times as a Category 1 hurricane; Isaias caused $4.8 billion in damage overall. In late August, Laura made landfall in Louisiana as a Category 4 hurricane, becoming the strongest tropical cyclone on record in terms of wind speed to make landfall in the state, alongside the 1856 Last Island hurricane and Ida. Laura caused at least $19 billion in damage and 77 deaths. September was the most active month on record in the Atlantic, with ten named storms. Slow-moving Hurricane Sally impacted the United States Gulf Coast, causing severe flooding. The Greek alphabet was used for only the second time, starting on September 17 with Subtropical Storm Alpha, which made landfall in Portugal on the following day. (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): Tropical Low 15U

South Pacific (2023–24): No active systems

South Atlantic (2023–24): No active systems

Last updated: 04:38, 20 April 2024 (UTC)

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Tropical cyclone anniversaries

April 27

1974 - Tropical Storm Babe passed just to the east of Guam before hitting Saipan as a developing system.
1995 - As a tropical depression, Tropical Storm Chuck (pictured) develops out over in the Marshall Islands causing only minor damage.

April 28

1973 - An unnamed cyclone, sometimes called Cyclone Flores, rapidly strengthened into a Category 3 severe tropical cyclone in the Banda Sea of Indonesia. The storm killed 1,653 people, becoming the deadliest tropical cyclone recorded in the Southern Hemisphere.
2006 - Cyclone Mala (pictured) reached its peak intensity, with a minimum central pressure of 954 hPa (mbar) in the Bay of Bengal. Mala struck Burma soon after, killing 22 people.

April 29

1892 - A cyclone struck Mauritius with gusts to 216 km/h (134 mph); much of the island was destroyed, with 1,200 fatalities and 50,000 people left homeless.
1991 - A powerful cyclone (pictured) made landfall near Chittagong, Bangladesh killing 138,866 people and causing $1.5 billion worth of damage.
2014 - Typhoon Tapah reached peak intensity with 1-minute sustained winds of 130 km/h (80 mph) while affecting the Mariana Islands.

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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 1A 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 2Hurricane response involves working in hazardous conditions, including contamination and electrocution hazards from floodwater.
Image 3
South-West Indian Ocean cyclone
(from Cyclone)
Image 4The 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 5An extratropical cyclone near Iceland (from Cyclone)
Image 62017 Atlantic hurricane season summary map (from Cyclone)
Image 7Hurricane Catarina, a rare South Atlantic tropical cyclone viewed from the International Space Station on March 26, 2004 (from Cyclone)
Image 8Surface weather map of the 1935 Labor Day hurricane moving up the west coast of Florida (from Tropical cyclone observation)
Image 9The aftermath of Hurricane Katrina in Gulfport, Mississippi. (from Tropical cyclone preparedness)
Image 10A polar low over the Sea of Japan in December 2009 (from Cyclone)
Image 11Tropical 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 12Subtropical Storm Alex in the north Atlantic Ocean in January 2016 (from Cyclone)
Image 13Broken 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 14Personnel and equipment from the National Guard of the United States en route to Hurricane Florence response efforts in 2018
Image 15Comparison between extratropical and tropical cyclones on surface analysis (from Cyclone)
Image 16
South Pacific cyclone
(from Cyclone)
Image 17The 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 18All 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 19Hurricane Isabel (2003)'s effect on the North Carolina Outer Banks (from Effects of tropical cyclones)
Image 20Chart with concurrent information for Hurricane Arlene and Tropical Storm Bret logged and plotted (from Tropical cyclone preparedness)
Image 21
Pacific hurricane
(from Cyclone)
Image 22An example of a chart for Matthew showing its five-day forecast track (from Tropical cyclone preparedness)
Image 23Aerial image of destroyed houses in Tacloban, following Typhoon Haiyan (from Effects of tropical cyclones)
Image 24The 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 25
North Indian Ocean cyclone
(from Cyclone)
Image 26Flooding 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 27
Australian region cyclone
(from Cyclone)
Image 28Percentages of hurricane deaths in the United States from 1970 to 1999. (from Effects of tropical cyclones)
Image 29The aftermath of Hurricane Katrina in Gulfport, Mississippi. Katrina was the costliest tropical cyclone in United States history. (from Effects of tropical cyclones)
Image 30
Pacific typhoon
(from Cyclone)
Image 31
Atlantic hurricane
(from Cyclone)
Image 32Radar image of Hurricane Erika making landfall over Northeastern Mexico (from Tropical cyclone observation)
Image 33Cyclone on Mars, imaged by the Hubble Space Telescope (from Cyclone)

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

The 1996 Atlantic hurricane season had 13 named storms, of which 9 became hurricanes and 6 became major hurricanes (hurricanes that are classified as Category 3 or higher). These major hurricanes were Bertha, Edouard, Fran, Hortense, Isidore, and Lili. This timeline documents all the storm formations, strengthening, weakening, landfalls, extratropical transitions, as well as dissipation. The timeline also includes information that was not operationally released, meaning that information from post-storm reviews by the National Hurricane Center, such as information on a storm that was not operationally warned on, has been included. The season officially began on June 1, 1996, and ended on November 30 that same year.

The season's most destructive storms were Hurricane Cesar, Hurricane Fran, and Hurricane Hortense. Hurricane Cesar (later known as Hurricane Douglas in the Eastern Pacific basin) was the deadliest storm of the season; it killed at least 51 people and caused severe damage in northern Colombia and southern Central America. Hurricane Fran caused $3.2 billion (1996 USD) worth of damage in the United States, mostly in North Carolina, and killed 26 people. Hurricane Hortense dropped torrential rainfall on southwestern Puerto Rico and the eastern Dominican Republic, killing 21 people and leaving behind $127 million (1996 USD) in damage. All three storms had their names retired by the World Meteorological Organization in the spring of 1997, and were replaced with Cristobal, Fay, and Hanna for the 2002 season, respectively. (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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