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South Atlantic tropical cyclones are unusual weather events that occur in the southern hemisphere. Strong wind shear (which disrupts cyclone formation) and a lack of weather disturbances favorable for tropical cyclone development make any hurricane-strength cyclones extremely rare. Since 2011, the Brazilian Navy Hydrographic Center has 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). Below is a list of notable South Atlantic tropical and subtropical cyclones.

History[edit]

Until April 1991 it was thought that tropical cyclones did not develop within the South Atlantic.[1] This was for various reasons including very strong vertical wind shear in the troposphere and there being no intertropical convergence zone within the basin.[2] However, during April 1991, this assertion was proved wrong, when the United States National Hurricane Center reported that a tropical cyclone had developed over the Eastern Atlantic.[1][3] Over the next 13 years a few systems were suspected to have the characteristics needed to be classified as a tropical cyclone including in March 1994 and January 2004.[4][5] During March 2004, an extratropical cyclone formally transitioned into a tropical cyclone and made landfall on Brazil, after becoming a category 2 hurricane on the Saffir-Simpson hurricane wind scale. While the system was threatening the Brazilian state of Santa Catarina, a newspaper used the headline "Furacão Catarina," which was presumed to mean "furacão (hurricane) threatening (Santa) Catarina (the state)".[1] However, when the international press started monitoring the system, it was assumed that "Furacão Catarina" meant "Cyclone Catarina" and that it had been formally named in the usual way.[1]

At the Sixth WMO International Workshop on Tropical Cyclones (IWTC-VI) in 2006 it was questioned if any subtropical or tropical cyclones, had developed within the South Atlantic before Catarina.[5] It was noted that suspect systems had developed in January 1970, March 1994, January 2004, March 2004, May 2004, February 2006 and March 2006.[5] It was also suggested that an effort should be made to locate any possible systems using satellite imagery and synoptic data, however, it was noted that this effort maybe hindered by the lack of any geostationary imagery over the basin before 1966.[5] A study was subsequently performed and published during 2008 which concluded that there had been 92 subtropical cyclones in the Southern Atlantic between 1957 and 2008.[6] During January 2009 a subtropical storm developed over the basin, before a tropical storm developed during March 2010 and was named Anita by Brazilian public and private weather services.[7][8] During 2011, the Brazilian Navy Hydrographic Center started to assign names to tropical and subtropical cyclones, that develop within its area of responsibility to the west of 20°W when they have sustained wind speeds of at least 65 km/h (40 mph).[9]

Known occurrences and impacts[edit]

1991 Angola tropical cyclone[edit]

Tropical storm (SSHWS)
Duration April 10, 1991 – April 14, 1991
Peak intensity 65 km/h (40 mph) (1-min) 

A low pressure area formed over the Congo Basin on April 9. The next day it moved offshore northern Angola with a curved cloud pattern. It moved westward over an area of warm waters, and the circulation became better defined. According to the United States National Hurricane Center, the system was probably either a tropical depression or a tropical storm at its peak intensity. On April 14, the system rapidly dissipated as it was absorbed into a large squall line.[10][11]

Cyclone Catarina[edit]

Category 2 tropical cyclone (SSHWS)
Duration March 24, 2004 – March 28, 2004
Peak intensity 155 km/h (100 mph) (1-min)  972 mbar (hPa)
Main article: Cyclone Catarina

Cyclone Catarina was an extraordinarily rare tropical cyclone, forming in the southern Atlantic Ocean in March 2004.[12] Just after becoming a hurricane, it hit the southern coast of Brazil in the state of Santa Catarina on the evening of March 28, with winds estimated near 155 kilometres per hour (96 mph), making it a Category 2-equivalent on the Saffir-Simpson Hurricane Scale. The cyclone killed 3 to 10 people and caused millions of dollars in damage in Brazil.

At the time, the Brazilians were taken completely by surprise, and were at first in utter disbelief that an actual tropical cyclone could have formed in the South Atlantic despite the insistence of the National Hurricane Center otherwise. Later, they were convinced, and adopted the name "Catarina" for the storm, after Santa Catarina state. This event is considered by some meteorologists to be a nearly once-in-a-lifetime occurrence.

Tropical Storm Anita[edit]

Tropical storm (SSHWS)
Duration March 8, 2010 – March 12, 2010
Peak intensity 85 km/h (50 mph) (1-min)  995 mbar (hPa)

On March 8 2010, a previously extratropical cyclone developed tropical characteristics and was classified as a subtropical cyclone off the coast of southern Brazil. The following day, the United States Naval Research Laboratory began monitoring the system as a system of interest under the designation of 90Q. The National Hurricane Center also began monitoring the system as Low SL90. During the afternoon of March 9, the system had attained an intensity of 55 km/h (35 mph) and a barometric pressure of 1000 hPa (mbar). It was declared a tropical storm on March 10 and became extratropical late on March 12.[13] Anita's accumulated cyclone energy was estimated at 2.0525 by the Florida State University. There was no damage associated to the storm, except high sea in the coasts of Rio Grande do Sul and Santa Catarina. Post mortem, the cyclone was given the name "Anita" by private and public weather centers from Southern Brazil.[14]

Subtropical Storm Arani[edit]

Subtropical storm (SSHWS)
Duration March 10, 2011 – March 16, 2011
Peak intensity 85 km/h (50 mph) (1-min)  989 mbar (hPa)

Early on March 14, 2011, the Navy Hydrographic Center-Brazilian Navy (SMM), in coordination with the National Institute of Meteorology, were monitoring an organizing area of convection near the southeast coast of Brazil.[15] Later that day a low pressure area developed just east of Vitória, Espírito Santo,[16] and by 1200 UTC, the system organized into a subtropical depression, located about 140 km (90 mi) east of Campos dos Goytacazes.[17] Guided by a trough and a weak ridge to its north, the system moved slowly southeastward over an area of warm waters,[18][19] intensifying into Subtropical Cyclone Arani on March 15,[20] as named by the Brazilian Navy Hydrographic Center.[21] The storm was classified as subtropical, as the convection was east of the center. On March 16, Arani began experiencing 25 knots of wind shear because another frontal system bumped it from behind.[22]

Before it developed into a subtropical cyclone, Arani produced torrential rains over portions of southeastern Brazil, resulting in flash flooding and landslides. Significant damage was reported in portions of Espírito Santo, though specifics are unknown.[23] Increased swells along the coast prompted ocean travel warnings.[24]

Subtropical Storm Bapo[edit]

Subtropical storm (SSHWS)
Duration February 5, 2015 – February 8, 2015
Peak intensity 65 km/h (40 mph) (1-min)  992 mbar (hPa)

During February 5, a subtropical depression developed about 170 km (105 mi) to the southeast of São Paulo, Brazil.[25] Over the next day low-level baroclincity decreased around the system, as it moved south-eastwards away from the Brazilian coast and intensified further.[26] The system was named Bapo by the Brazilian Navy Hydrography Center during February 6, after it had intensified into a subtropical storm.[27][28] Over the next couple of days the system continued to move south-eastwards before it transitioned into an extratropical cyclone during February 8.[29]

Other systems[edit]

MODIS visible satellite imagery a possible January 2004 tropical cyclone

According to a presentation at the Sixth WMO International Workshop on Tropical Cyclones (IWTC-VI), satellite imagery from January 1970 showed that a system with an eyewall had developed behind a cold front and that the system needed further analysis to determine if it was tropical or subtropical.[5] On March 27, 1974, a weak area of low pressure that had originated over the Amazon River started to intensify further.[30] Over the next 48 hours the system quickly developed further and was classified as subtropical, as it developed a banding structure and deep convection near its warm core.[30] On March 29, a north-westerly flow encroached on the systems environment, which caused the system to rapidly move towards 40S and the cold waters that were present to the south of 40°S.[30] In March 1994, a system that was weaker than Catarina was spawned but was located over cool and open waters.[31]

During 2004 the large scale conditions over the South Atlantic, were more conducive than usual for subtropical or tropical systems with 4 systems noted.[5] The first possible tropical cyclone developed within a trough of low pressure, to the southeast of Salvador, Brazil on January 18.[4][5] The system subsequently displayed a small central dense overcast and was suspected to be at the peak of its development as either a tropical depression or a tropical storm during the enxt day.[4] The system was subsequently affected by some strong shear, before it moved inland and weakened along the coast of Brazil before it was last noted during January 21.[4] Within Brazil the system caused heavy rain and flooding with a state of emergency declared in Aracaju, after the river overflowed and burst its banks which flooded homes, destroyed crops and caused parts of the highway to collapse.[4] However, it was noted that not all of the heavy rain and impacts were attributable to the system, as a large monsoon low covered much of Brazil at the time.[4] The second system was a possible hybrid cyclone that developed near south-eastern Brazil between March 15–16.[5] Cyclone Catarina was the third system while the fourth system had a well defined eye like structure and formed off the coast of Brazil during May 15, 2004.[5]

MODIS visible satellite image of a possible February 2006 tropical cyclone

On February 22, 2006 a baroclinic cyclone intensified quickly and was estimated to have peaked with 1-minute sustained wind speeds of 65 mph (100 km/h), after radar data showed that the system had developed an eye and banding.[5] However, there were questions about how tropical the system was as it did not separate from the westerlies or the baroclinic zone it was in.[5][32] Between March 11–17, 2006, a system with a warm core developed and moved southwards along the South Atlantic Zone.[5]

Two subtropical cyclones affected both Uruguay and Rio Grande do Sul state in Brazil. On January 28, 2009, a cold-core mid to upper-level trough in phase with a low-level warm-core low formed a system and moved eastward into the South Atlantic.[33] The storm produced rainfall in 24 hours of 300 mm or more in some locations of Rocha (Uruguay) and southern Rio Grande do Sul. The weather station owned by MetSul Weather Center in Morro Redondo, Southern Brazil, recorded 278.2 mm in a 24-hour period. Fourteen deaths and thousands of evacuees are attributed to the storm with an emergency declared in four cities.[7] It lasted until February 1, when the cyclone became extratropical.[34] On November 16, 2010, a cold-core mid to upper-level trough in phase with a low-level warm-core low formed a system state in Brazil and moved southeastward into the South Atlantic, where it slightly deepened.[35] The system brought locally heavy rains in southern Brazil and northeast of Uruguay that exceeded 200 milimeters in a few hours in some locations of Southern Rio Grande do Sul northwest of Pelotas.[36] Damages and flooding were observed in Cerrito, São Lourenço do Sul and Pedro Osório.[36] Bañado de Pajas, departament of Cerro Largo in Uruguay, recorded 240 mm of rain.[36] The subtropical cyclone then became a weak trough on November 19, according to the CPTEC.[37]

Between December 23, 2013 and January 24, 2015, the Center for Weather Forecast and Climatic Studies (CPTEC) and Navy Hydrography Center monitored four subtropical depressions to the south of Rio de Janeiro. The first one lasted until Christmas Day.[38][39][40][41] Two subtropical depressions formed in 2014: one in late-February and the other in late-March.[42][43][44] A fourth one formed in late-January,[45][46] and like the March 2014 depression both struggled to mantain a closed circulation,[47] ultimately being absorbed by the the South Atlantic High.[48][49][50]

Storm names[edit]

The following names are published by the Brazilian Navy Hydrographic Center and used for named storms that form in the area west of 20ºW and south of equator in the South Atlantic Ocean since 2011. Arani is confirmed to be used again in the future after its next nine names are all used, but it is unclear if those names will be also rotated.[9]

  • Arani
  • Bapo
  • Cari (unused)
  • Deni (unused)
  • Eçaí (unused)
  • Guará (unused)
  • Iba (unused)
  • Jaguar (unused)
  • Kamby (unused)
  • Mani (unused)

See also[edit]

References[edit]

  1. ^ a b c d Padgett, Gary. "Monthly Tropical Cyclone Summary March 2004". Archived from the original on February 7, 2015. Retrieved February 7, 2015. 
  2. ^ Landsea, Christopher W (July 13, 2005). "Subject: Tropical Cyclone Names: G6) Why doesn't the South Atlantic Ocean experience tropical cyclones?". Tropical Cyclone Frequently Asked Question. United States National Oceanic and Atmospheric Administration's Hurricane Research Division. Archived from the original on February 7, 2015. Retrieved February 7, 2015. 
  3. ^ National Hurricane Center (1991). McAdie, Colin J; Rappaport, Edward N, eds. II. Tropical cyclone activity in the Atlantic Basin: A. Overview (Diagnostic Report of the National Hurricane Center: June and July 1991). National Oceanic and Atmospheric Administration. p. 10-14. Retrieved May 12, 2013. 
  4. ^ a b c d e f Padgett, Gary. "Monthly Tropical Cyclone Summary January 2004". Archived from the original on February 7, 2015. Retrieved February 7, 2015. 
  5. ^ a b c d e f g h i j k l Topic 2a: The Catarina Phenomenon (PDF). The Sixth WMO International Workshop on Tropical Cyclones (IWTC-VI). San José, Costa Rica: World Meteorological Organization. 2006. pp. 329–360. Archived from the original on February 7, 2015. Retrieved February 7, 2015. 
  6. ^ Braun, Aviva J (2008). "Subtropical Storms in the South Atlantic Basin and their Correlation with Australian East-Coast Cyclones" (PDF). American Meteorological Society. Retrieved November 19, 2010. 
  7. ^ a b Padgett, Gary (April 7, 2009). "January 2009 Tropical Weather Summary". Retrieved April 15, 2010. 
  8. ^ Padgett, Gary. "Monthly Global Tropical Cyclone Tracks March 2010". Archived from the original on February 7, 2015. Retrieved February 7, 2015. 
  9. ^ a b "Normas Da Autoridade Marítima Para As Atividades De Meteorologia Marítima" (in Portuguese). Brazilian Navy. 2011. Archived from the original on February 6, 2015. Retrieved February 6, 2015. 
  10. ^ National Hurricane Center (1991). McAdie, Colin J; Rappaport, Edward N, eds. II. Tropical cyclone activity in the Atlantic Basin: A. Overview (Diagnostic Report of the National Hurricane Center: June and July 1991). National Oceanic and Atmospheric Administration. p. 10, 13, 14. Retrieved May 12, 2013. 
  11. ^ Marcel Leroux (2001). "Tropical Cyclones". The Meteorology and Climate of Tropical Africa. Praxis Publishing Ltd. p. 314. Retrieved March 28, 2013. 
  12. ^ College of Earth and Mineral Sciences (2004). "Upper-level lows". Pennsylvania State University. Retrieved 2009-05-14. 
  13. ^ http://www.webcitation.org/5o7vOfDzk
  14. ^ "Monitoramento - Ciclone tropical na costa gaúcha" (in Portuguese). Brazilian Meteorological Service. March 2010. 
  15. ^ Chura, Ledesma, Davison (March 14, 2011). "South American Synopsis". Hydrometeorological Prediction Center. Retrieved March 14, 2011. 
  16. ^ Chura, Ledesma, Davison (March 14, 2011). "South American Synopsis (2)". Hydrometeorological Prediction Center. Retrieved March 14, 2011. 
  17. ^ Marine Meteorological Service (March 14, 2011). "Weather and Sea Bulletin Referent Analysis 1200 GMT - 14/MAR/2011". Brazil Navy Hydrographic Center. Retrieved March 14, 2011. 
  18. ^ Chura, Ledesma, Davison (March 15, 2011). "South American Synopsis (3)". Hydrometeorological Prediction Center. Retrieved March 15, 2011. 
  19. ^ Chura, Ledesma, Davison (March 15, 2011). "South American Synopsis (4)". Hydrometeorological Prediction Center. Retrieved March 15, 2011. 
  20. ^ Marine Meteorological Service (March 15, 2011). "Severe Weather Warnings". Brazil Navy Hydrographic Center. Retrieved March 15, 2011. 
  21. ^ "Severe Weather Warnings - March 11, 2011". Brazilian Navy. March 11, 2011. Retrieved March 15, 2011. 
  22. ^ Rob Gutro (March 15, 2011). "NASA's Aqua Satellite Spots Rare Southern Atlantic Sub-tropical Storm". National Aeronautics and Space Administration. Retrieved March 15, 2011. 
  23. ^ Unattributed (March 16, 2011). "Arani – tempestade subtropical afasta-se da costa do ES" (in Portuguese). Climatempo. Retrieved March 19, 2011. 
  24. ^ Unattributed (March 16, 2011). "Após formar um olho, ciclone subtropical Arani perde força nesta quarta" (in Portuguese). Jornal De Tempo. Retrieved March 19, 2011. 
  25. ^ "Weather and Sea Bulletin Referent Analysis 1200 UTC for February 5, 2015". Marinha do Brasil - Navy Hydrographic Centre. February 5, 2015. Retrieved February 5, 2015. 
  26. ^ http://www.webcitation.org/6WC1P8mZO
  27. ^ http://thevane.gawker.com/rare-subtropical-storm-forms-off-the-coast-of-brazil-1684420069
  28. ^ "Análise Sinótica – 06/02/2015". CPTEC - INPE. February 6, 2015. Retrieved February 6, 2015. 
  29. ^ "Weather and Sea Bulletin Referent Analysis 0000 UTC - 08/FEB/2015". Brazilian Navy Hydrography Center - Marine Meteorological Service. Archived from the original on February 8, 2015. Retrieved February 8, 2015. 
  30. ^ a b c McTaggart-Cowan, Ron; Bosart, Lance; Davis, Christopher; Eyad, Atallah; Gyakum, John; Emaunel, Kerry (2006). "Analysis of Hurricane Catarina (2004)". Monthly Weather Review (American Meteorological Society) 134 (11): 3048–3049. Bibcode:2006MWRv..134.3029M. doi:10.1175/MWR3330.1. 
  31. ^ Henson, Bob (2005). "What was Catarina?". University Corporation for Atmospheric Research. Retrieved February 8, 2015. 
  32. ^ Padgett, Gary. "Monthly Tropical Cyclone Summary February 2006". Retrieved February 7, 2015. 
  33. ^ "Boletim Técnico – 30/01/2009" (in Portuguese). CPTEC - INPE. January 30, 2009. Retrieved February 8, 2009. 
  34. ^ "Boletim Técnico – 01/02/2009" (in Portuguese). CPTEC - INPE. February 1, 2009. Retrieved February 8, 2009. 
  35. ^ "Análise Sinótica: 17/11/2010-00Z" (in Portuguese). CPTEC - INPE. November 2010. Archived from the original on November 19, 2010. 
  36. ^ a b c "Baixas começam a semana "em alta"" (in Portuguese). METSUL. November 2010. Archived from the original on November 19, 2010. 
  37. ^ "Boletim Technico 19/11/10 - 00z". CPTEC. 
  38. ^ "Análise Sinótica – 23/12/2013" (in Portuguese). CPTEC - INPE. December 23, 2013. Retrieved February 24, 2014. 
  39. ^ "Análise Sinótica – 24/12/2013" (in Portuguese). CPTEC - INPE. December 24, 2013. Retrieved February 24, 2014. 
  40. ^ "SÍNTESE SINÓTICA DEZEMBRO DE 2013" (in Portuguese). CPTEC - INPE. Retrieved February 24, 2014. 
  41. ^ "Análise Sinótica – 25/12/2013" (in Portuguese). CPTEC - INPE. December 25, 2013. Retrieved February 24, 2014. 
  42. ^ "Weather and Sea Bulletin Referent Analysis 1200 UTC for 20 Feb 2014". Navy Hydrography Center/Brazilian Navy. February 20, 2014. Retrieved February 21, 2014. 
  43. ^ "Análise Sinótica – 28/03/2014" (in Portuguese). CPTEC - INPE. March 28, 2014. Retrieved January 7, 2015. 
  44. ^ "Meteoromarinha referente à análise de 1200 HMG - 28/mar/2014" (in Portuguese). Navy Hydrography Center. March 28, 2014. Retrieved January 7, 2015. 
  45. ^ "Sea Level Pressure Chart 1200 UTC for 23 Jan 2015". Marinha do Brasil - Navy Hydrographic Centre. January 23, 2015. Retrieved January 25, 2015. 
  46. ^ "Sea Level Pressure Chart 0000 UTC for 24 Jan 2015". Marinha do Brasil - Navy Hydrographic Centre. January 24, 2015. Retrieved January 25, 2015. 
  47. ^ "Análise Sinótica – 29/03/2014" (in Portuguese). CPTEC - INPE. March 29, 2014. Retrieved January 7, 2015. 
  48. ^ "Meteoromarinha referente à análise de 0000 HMG - 29/mar/2014" (in Portuguese). Navy Hydrography Center. March 29, 2014. Retrieved January 7, 2015. 
  49. ^ "Análise Sinótica – 30/03/2014" (in Portuguese). CPTEC - INPE. March 30, 2014. Retrieved January 7, 2015. 
  50. ^ "Sea Level Pressure Chart 1200 UTC for 24 Jan 2015". Marinha do Brasil - Navy Hydrographic Centre. January 24, 2015. Retrieved January 25, 2015. 

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