Tropical cyclone basins

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Traditionally, areas of

Category 3 intensity).[1]

Overview

Tropical cyclone basins and official warning centre.
Basin Warning Center Area of responsibility Refs
Northern Hemisphere
North Atlantic
Eastern Pacific		 United States National Hurricane Center
United States Central Pacific Hurricane Center		 Equator northward, African Coast – 140°W
Equator northward, 140°W-180		 [2]
Western Pacific Japan Meteorological Agency Equator-60°N, 180-100°E [3]
North Indian Ocean India Meteorological Department Equator northward, 100°E-45°E
Southern Hemisphere
South-West Indian Ocean Meteo France Reunion Equator-40°S, African Coast-90°E [4]
Australian region
Badan Meteorologi, Klimatologi, dan Geofisika
Papua New Guinea National Weather Service
Australian Bureau of Meteorology
 Equator-10°S, 90°E-141°E
Equator-10°S, 141°E-160°E
10°S-36°S, 90°E-160°E		 [5]
Southern Pacific
Meteorological Service of New Zealand
 Equator-25°S, 160°E-120°W
25°S-40°S, 160°E-120°W		 [5]

Northern Hemisphere

North Atlantic Ocean

Main article: Atlantic hurricane
Tracks of all tropical cyclones in the northern Atlantic Ocean between 1980 and 2005

This region includes the North

tropical weather systems for the Atlantic Basin as one of the Regional Specialized Meteorological Centres for tropical cyclones as defined by the World Meteorological Organization.[7] On average, 14 named storms (of tropical storm or higher strength) occur each season, with an average of 7 becoming hurricanes and 3 becoming major hurricanes. The climatological peak of activity is around September 10 each season.[8]

The United States Atlantic coast and Gulf Coast,

Hurricane Vince, which made landfall on the southwestern coast of Spain as a tropical depression in October 2005, and Subtropical Storm Alpha, which made landfall on the coast of Portugal as a subtropical storm in September 2020, are the only known systems to impact mainland Europe as a (sub)tropical cyclone in the NHC study period commencing in 1851[10] (it is believed a hurricane made landfall in Spain in 1842).[11]

Northeastern Pacific Ocean

Main article: Pacific hurricane
Tracks of all tropical cyclones in the northern Pacific Ocean east of the International Date Line between 1980 and 2005; the vertical line through the center separates the Central Pacific basin (under the Central Pacific Hurricane Center's watch) from the Northeastern Pacific basin (under the National Hurricane Center's area of responsibility).

The Northeastern Pacific is the second most active basin and has the highest number of storms per unit area. The hurricane season runs between May 15 and November 30 each year, and encompasses the vast majority of tropical cyclone activity in the region.

Category 3 intensity or greater) annually in the basin.[12]

Storms that form here often affect western

1976. 1997 and 2023 brought gale-force winds to California.[13]

The

Joint Hurricane Warning Center; today it is called the Joint Typhoon Warning Center
.

Central Pacific hurricanes are rare and on average 4 to 5 storms form or move in this area annually.

landfalls are rare; however, they occur occasionally, as with Hurricane Iniki in 1992, which made landfall on Hawaii,[16] and Hurricane Ioke in 2006, which made a direct hit on Johnston Atoll.[17]

Northwestern Pacific Ocean

Tracks of all tropical cyclones in the northwestern Pacific Ocean between 1980 and 2005. The vertical line to the right is the International Date Line.
Main article: Typhoon

The Northwest Pacific Ocean, or Western North Pacific, is the most active basin on the planet, accounting for one third of all tropical cyclone activity. Annually, an average of 25.7 tropical cyclones in the basin acquire

tropical storm strength or greater; also, an average of 16 typhoons occurred each year during the 1968–1989 period.[6][needs update] The basin occupies all the territory north of the equator and west of the International Date Line, including the South China Sea.[14] The basin sees activity year-round; however, tropical activity is at its minimum in February and March.[18]

Tropical storms in this region often affect

Northern Marianas and Palau. Sometimes, tropical storms in this region are powerful and long lasting enough enough to affect the more inland South East Asian nations of Laos, Thailand, and Cambodia, and in extreme cases, even the equatorial nations of Singapore, Brunei, Malaysia, and Indonesia. The coast of China sees the most landfalling tropical cyclones worldwide.[19] The Philippines receives an average of 6–7 tropical cyclone landfalls per year,[20] with typhoons Haiyan and Goni in 2013 and 2020 being the strongest and most powerful landfalling storms to date.[21]

North Indian Ocean

Tracks of all tropical cyclones in the northern Indian Ocean between 1980 and 2005
Main article: North Indian Ocean tropical cyclone

This basin is divided into two areas: the Bay of Bengal and the Arabian Sea, with the Bay of Bengal dominating (5 to 6 times more activity). Still, this basin is the least active worldwide, with only 4 to 6 storms per year.

This basin’s season has a double peak: one in April and May, before the onset of

vertical wind shear in between the surface monsoonal low and upper tropospheric high during the monsoon season tears apart incipient cyclones.[23] High shear explains why no cyclones can form in the Red Sea, which possesses the necessary depth, vorticity and surface temperatures year-round. Rarely do tropical cyclones that form elsewhere in this basin affect the Arabian Peninsula or Somalia; however, Cyclone Gonu
caused heavy damage in Oman on the peninsula in 2007.

Although the North Indian Ocean is a relatively inactive basin, extremely high population densities in the

Ayeyarwady Deltas mean that the deadliest tropical cyclones in the world have formed here, including the 1970 Bhola cyclone, which killed 500,000 people. Nations affected include India, Bangladesh, Sri Lanka, Thailand, Myanmar, and Pakistan
.

Mediterranean Sea

Main article:
Mediterranean tropical cyclone
Image of the January 1995 system

On rare occasions, tropical-like systems that can reach the intensity of hurricanes, occur over the

Chris (2012), or Ophelia (2017).[25] Sea surface temperatures in late-August and early-September are quite high over the basin (24/28 °C or 75/82 °F), though research indicates water temperatures of 20 °C (68 °F) are normally required for development.[26]

Meteorological literature document that such systems occurred in September 1947, September 1969, January 1982, September 1983, January 1995, October 1996, September 2006, November 2011, November 2014, and November 2017.[27][28] The 1995 system developed a well-defined eye, and a ship recorded 85 mph (140 km/h) winds, along with an atmospheric pressure of 975 mbar. Although it had the structure of a tropical cyclone, it occurred over 61 °F (16 °C) water temperatures, suggesting it could have been a polar low.[29]

Southern Hemisphere

Within the Southern Hemisphere tropical cyclones generally form on a regular basis between the African coast and the middle of the South Pacific. Tropical and Subtropical Cyclones have also been noted occurring in the Southern Atlantic Ocean at times. For various reasons including where tropical cyclones form, there are several different ways to split the area between the American and African coasts. For instance the World Meteorological Organization define three different basins for the tracking and warning of tropical cyclones. These are the South-West Indian Ocean between the African Coast and 90°E, the Australian region between 90°E and 160°E and the South Pacific between 160°E and 120°W. The United States Joint Typhoon Warning Center also monitors the whole region, but splits it at 135°E into the South Pacific and the Southern Indian Ocean.

South-West Indian Ocean

Tracks of all tropical cyclones in the southwestern Indian Ocean between 1980 and 2005
Main article:
South-West Indian Ocean cyclone season

The South-West Indian Ocean is located within the Southern Hemisphere between the Africa's east coast and 90°E and is primarily monitored by the Meteo France's La Reunion RSMC, while the Mauritian, Australian, Indonesian, and Malagasy weather services also monitor parts of it.[30] Until the start of the 1985–86 tropical cyclone season the basin only extended to 80°E, with the 10 degrees between 80 and 90E considered to be a part of the Australian region.[31] On average about 9 cyclones per year develop into tropical storms, while 5 of those go on to become tropical cyclones that are equivalent to a hurricane or a typhoon.

Australian region

Tracks of all tropical cyclones in the southeastern Indian Ocean between 1980 and 2005
Main article:
Australian region cyclone season

Through the middle of 1985, this basin extended westward to 80°E. Since then, its western boundary has been 90°E.[31] Tropical activity in this region affects Australia and Indonesia. According to the Australian Bureau of Meteorology, the most frequently hit portion of Australia is between Exmouth and Broome in Western Australia.[32] The basin sees an average of about seven cyclones each year, although more can form or come in from other basins, such as the South Pacific.[6][33][34] The tropical cyclone Cyclone Vance in 1999 produced the highest recorded speed winds in an Australian town or city at around 267 km/h (166 mph).[35]

South Pacific Ocean

Main article: South Pacific tropical cyclone
Tracks of all tropical cyclones in the southwestern Pacific Ocean between 1980 and 2005

The South Pacific Ocean basin runs between 160°E and 120°W, with tropical cyclones developing in it officially monitored by the Fiji Meteorological Service and New Zealand's MetService.[5] Tropical Cyclones that develop within this basin generally affect countries to the west of the dateline, though during years of the warm phase of El Niño–Southern Oscillation cyclones have been known to develop to the east of the dateline near French Polynesia. On average the basin sees nine tropical cyclones annually with about half of them becoming severe tropical cyclones.

South Atlantic Ocean

See also: South Atlantic tropical cyclone
Tracks of named South Atlantic tropical and subtropical cyclones since 2004

Cyclones rarely form in other tropical ocean areas, which are not formally considered tropical cyclone basins. Tropical depressions and tropical storms occur occasionally in the

regional specialized meteorological center (RSMC). However, beginning in 2011, the Brazilian Navy
Hydrographic Center started to assign names to tropical and subtropical systems in this basin, when they have sustained wind speeds of at least 65 km/h (40 mph).

See also

References

  1. Chris Landsea. "Climate Variability table — Tropical Cyclones". Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration
    . Retrieved October 19, 2006.
  2. ^ RA IV Hurricane Committee (May 9, 2023). Hurricane Operational Plan for North America, Central America and the Caribbean 2023 (PDF) (Report). World Meteorological Organization. Retrieved July 29, 2023.
  3. ^ WMO/ESCP Typhoon Committee (March 13, 2015). Typhoon Committee Operational Manual Meteorological Component 2015 (PDF) (Report No. TCP-23). World Meteorological Organization. pp. 40–41. Retrieved March 28, 2015.
  4. ^ RA I Tropical Cyclone Committee (2023). Tropical Cyclone Operational Plan for the South-West Indian Ocean (PDF) (Report). World Meteorological Organization.
  5. ^ a b c RA V Tropical Cyclone Committee (2023). Tropical Cyclone Operational Plan for the South-East Indian Ocean and the Southern Pacific Ocean 2023 (PDF) (Report). World Meteorological Organization. Retrieved October 23, 2023.
  6. ^
    NOAA
    . Retrieved November 30, 2006.
  7. ^ Climate Prediction Center (August 8, 2006). "Background Information: The North Atlantic Hurricane Season". National Oceanic and Atmospheric Administration. Retrieved March 14, 2007.
  8. ^ National Hurricane Center. "Tropical Cyclone Climatology". National Oceanic and Atmospheric Administration. Retrieved November 5, 2021.
  9. ^ Blake, Eric S. (November 14, 2006). "Tropical Cyclone Report: Hurricane Gordon: 10–20 September 2006" (PDF). National Hurricane Center. Retrieved November 29, 2006.
  10. ^ Franklin, James L. (February 22, 2006). "Tropical Cyclone Report: Hurricane Vince: 8–11 October 2005" (PDF). National Hurricane Center. Retrieved November 29, 2006.
  11. doi:10.1175/BAMS-89-2-191
    .
  12. ^ a b Climate Prediction Center, NOAA (May 22, 2006). "Background Information: East Pacific Hurricane Season". National Oceanic and Atmospheric Administration. Retrieved May 24, 2006.
  13. ^ a b Chenoweth, Michael and Christopher Landsea (November 2004). "The San Diego Hurricane of 2 October 1858" (PDF). American Meteorological Society. Retrieved December 1, 2006.
  14. ^
    NOAA
    . Retrieved July 25, 2006.
  15. ^ a b Central Pacific Hurricane Center. "CPHC Climatology". National Oceanic and Atmospheric Administration. Retrieved March 2, 2007.
  16. ^ Central Pacific Hurricane Center (1992). "The 1992 Central Pacific Tropical Cyclone Season". Retrieved March 2, 2007.
  17. ^ Leone, Diana (August 23, 2006). "Hawaiian-named storm hits Johnston Isle". Star Bulletin. Retrieved March 2, 2007.
  18. NOAA
    . Retrieved July 25, 2006.
  19. ^ Weyman, James C. and Linda J. Anderson-Berry (December 2002). "Societal Impact of Tropical Cyclones". Fifth International Workshop on Tropical Cyclones. Atlantic Oceanographic and Meteorological Laboratory. Retrieved April 26, 2006.
  20. ^ Shoemaker, Daniel N. (1991). "Characteristics of Tropical Cyclones Affecting the Philippine Islands" (PDF). Joint Typhoon Warning Center. Archived from the original (PDF) on February 5, 2012. Retrieved November 29, 2006.
  21. ^ Why Typhoon Haiyan Caused So Much Damage (Report). NPR. November 11, 2013. Retrieved November 25, 2017.
  22. ^ Joint Typhoon Warning Center (2004). "1.2: North Indian Tropical Cyclones". 2003 Annual Tropical Cyclone Report. Archived from the original on June 7, 2011. Retrieved November 29, 2006.
  23. ISBN 0471994065
  24. ^ "Medicanes: cataloguing criteria and exploration of meteorological environments Archived March 29, 2019, at the Wayback Machine". www.tethys.cat.
  25. doi:10.5194/adgeo-2-217-2005
    .
  26. ^ Microsoft Word – EGS2000-Plinius-II-Meneguzzo.doc Archived May 25, 2003, at the Wayback Machine
  27. ISBN 978-0-521-62430-5
    . Retrieved January 27, 2011.
  28. ^ Schwartz (November 7, 2011). "TXMM21 KNES 071819". Satellite Services Division. National Oceanic and Atmospheric Administration. Archived from the original on November 12, 2011. Retrieved November 7, 2011.
  29. ^ "DR. JACK BEVEN'S Images of the Mediterranean 'Hurricane' (1995) Archived June 5, 2011, at the Wayback Machine". www.mindspring.com.
  30. DOC). Archived from the original
    on September 8, 2006. Retrieved November 29, 2006.
  31. ^ a b G. Kingston (August 1986). "The Australian Tropical Cyclone Season" (PDF). Australian Meteorology Magazine. 34: 103. Retrieved April 29, 2013.
  32. ^ "Tropical Cyclones in Western Australia – Climatology". Bureau of Meteorology. Retrieved August 8, 2006.
  33. ^ "BoM — Severe Weather Event". Bureau of Meteorology. Retrieved October 19, 2008.
  34. ^ "Tropical Cyclone Trends". Bureau of Meteorology. Archived from the original on September 23, 2012. Retrieved October 19, 2008.
  35. ^ "BoM — Cyclone Vance produces highest recorded wind speed in Australia". Bureau of Meteorology. Retrieved October 19, 2008.

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