2010–11 South-West Indian Ocean cyclone season

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2010–11 South-West Indian Ocean cyclone season
Season summary map
First system formed October 25, 2010
Last system dissipated April 16, 2011
Strongest storm Bingiza – 953 hPa (mbar), 165 km/h (105 mph) (10-minute sustained)
Total disturbances 9
Total depressions 6
Total storms 4
Tropical cyclones 2
Intense tropical cyclones 1
Total fatalities 34 total
Total damage Unknown
South-West Indian Ocean tropical cyclone seasons
2008–09, 2009–10, 2010–11 2011–12, 2012–13
Related articles

The 2010–11 South-West Indian Ocean cyclone season was the second-quietest cyclone season on record in the basin, producing only four systems of gale-intensity.[1] The strongest system of the season was Intense Tropical Cyclone Bingiza which attained peak winds of 165 km/h (105 mph) off the northeastern coast of Madagascar in February. Bingiza was also the only storm to affect land, causing extensive damage and 34 fatalities across Madagascar.

On 22 October 2010, the MMS, released their seasonal outlook and predicted that there would be between 8 and 10 named storms within the basin during the season.[2] At the end of December, the MMS issued an updated seasonal outlook, predicting that only 6–8 named tropical storms would develop during 2010–11.[3]

Storms[edit]

Tropical cyclone scales#Comparisons across basins

Tropical Cyclone Abele[edit]

Tropical cyclone (MFR)
Category 1 tropical cyclone (SSHWS)
Duration November 29 – December 3 (exited basin)
Peak intensity 130 km/h (80 mph) (10-min)  973 mbar (hPa)

On November 29, both the TCWC Perth and the Météo-France (MFR) reported that a tropical disturbance had formed within the South-West Indian Ocean, and gave it the identifier "02".[4] Later that day, the Joint Typhoon Warning Center (JTWC) classified it as Tropical Cyclone 03S, locating it 700 nautical miles (1,300 km; 810 mi) west of Cocos Island.[5] On November 30, the MFR upgraded the disturbance into a tropical depression.[6] On December 1 it was named Abele by the Mauritius Meteorological Service as it became the first tropical storm of the season.[7] On the very same day, the MFR reported that Abele intensified into a severe tropical storm.[8] On December 2, the MFR reported that Abele continued to intensify and became a tropical cyclone.[9] It was given a Category 1 Tropical cyclone status by the JTWC.[10] On December 3, both the JTWC and MFR reported that Abele crossed 90°E and moved into the Australian region.[11][12]

Intense Tropical Cyclone Bingiza[edit]

Intense tropical cyclone (MFR)
Category 3 tropical cyclone (SSHWS)
Duration February 8 – February 18
Peak intensity 165 km/h (105 mph) (10-min)  953 mbar (hPa)
Main article: Cyclone Bingiza

Bingiza was first identified as a zone of disturbed weather on February 6 located well to the northeast of Madagascar. For a few days it meandered generally southwestward, failing to intensify significantly. The system was subsequently classified as a tropical disturbance on February 8 and reached moderate tropical storm strength the following day.[13] On February 12, the storm began a steady westward track as environmental conditions became more favorable. In a 24–hour period, Bingiza developed from a moderate tropical storm into an intense tropical cyclone with a well-defined eye.[13][14] After attaining peak 10–minute sustained winds of 165 km/h (105 mph), the cyclone moved ashore in northeastern Madagascar on February 14 and quickly weakened as it crossed the country. It emerged into the Mozambique Channel as a weak tropical disturbance, and it turned southward to move across western Madagascar. Bingiza attained tropical storm status before making its final landfall near Morondava on February 17.[15] The remnant cyclone emerged back over the Indian Ocean on late on February&nbs;18 as it turned to the south and southwest. Meandering near the southern coast of Madagascar, Bingiza later transitioned into an extratropical cyclone on February 21 before dissipating the next day.[13]

Across Madagascar, the cyclone killed 34 people and injured 13 others.[16] High winds destroyed 25,464 houses, which left 25,845 people homeless.[17] Bingiza first affected the Masoala National Park, destroying half of a village and leaving it isolated.[18] High winds and heavy rainfall left over 500 km2km (195 mi2) of damaged crops, which increased food prices and threatened the economic livelihoods of the affected people.[17]

Moderate Tropical Storm Cherono[edit]

Moderate tropical storm (MFR)
Tropical storm (SSHWS)
Duration 14 March (Entered basin) – 23 March
Peak intensity 75 km/h (45 mph) (10-min)  992 mbar (hPa)

On 14 March, Tropical Low 23U crossed from the Australian region into the South West Indian Ocean basin, and was classified as Tropical Disturbance 07. It quickly strengthened the next day into a Tropical Depression, before being upgraded to Moderate Tropical Storm strength and being named Cherono. By 19 March, it was reported to be weakening and on 23 March Cherono dissipated.

Subtropical Depression 09[edit]

Subtropical depression (MFR)
Duration 13 April – 16 April
Peak intensity 95 km/h (60 mph) (10-min)  985 mbar (hPa)

On 13 April, a Subtropical Depression formed south-east of Madagascar. It retained subtropical characteristics, while the winds reached that equivalent of a Severe Tropical Storm strength.

Other storms[edit]

Tropical Depression 01 on October 26

On October 25, RSMC La Reunion reported that a tropical disturbance has formed in the South Western Indian Ocean, and gave it the identifier "01".[19] On the same day, the Joint Typhoon Warning Center (JTWC) identified the tropical disturbance as a low pressure area, located at approximately 800 nautical miles (1,500 km; 920 mi) east of Diego Garcia. On October 26, the MFR upgraded the disturbance into a tropical depression.[20] Later that day, the JTWC upgraded the low pressure area directly into a tropical storm.[21] On October 27, the MFR reported that the system slightly weakened.[22] Later that day, the MFR reported that the system further weakened into a Tropical Disturbance.[23] Late on the same day, the JTWC has also reported that the storm weakened into a lower end Tropical Depression issuing their final warning on the system.[24] Despite its weakness, the system had very good convection and showed a few signs of re-intensifying.[25] However, on October 29, the convection in the system started depleting and the disturbance continued to weaken.[26] Later, the MFR issued their final advisory on the disturbance.[27]

On December 28, an area of low pressure developed near Indonesia.[28] On January 2, the Météo-France (MFR) upgraded the area of low pressure into a tropical disturbance giving it the identifier "03".[29] A few hours later, the MFR upgraded the disturbance into a tropical depression.[30] Early the next day, the MFR reported that the depression started weakening and became a Tropical Disturbance.[31] A few hours later, the MFR issued their final advisory on the system.[32] On January 4, nearly a day after the system dissipated, the remnant had good convection developing around it.[33] Early on January 5, the convection in the remnants started depleting.[34] The remnants of the depression continued to track towards the west-southwest before turning southward several hundred kilometres northeast of Reunion on January 12. On January 15, the system began to redevelop, prompting the issuance of a Tropical Cyclone Formation Alert by the JTWC.[35] Early on 16 January, the remnants of the system had gained enough organization and the MFR reupgraded the system into a Tropical Depression. However, the system drifted straight and made landfall near Fenoarivo, Madagascar and quickly weakened over land.[36] This resulted in the cancellation of the Tropical Cyclone Formation Alert by the JTWC.[37] Late on January 17, the system dissipated completely.[38]

On 30 January, the Météo-France (MFR) upgraded an area of low pressure, south of La Réunion into a Tropical Disturbance and designated it with '04'.[39] Early on the next day, the MFR issued their last advisory on the system as it was no longer tropical.[40]

On 15 February, the Météo-France (MFR) upgraded an area of low pressure northeast of La Réunion into a Tropical Disturbance, and designated it with '06'.[41] The next day it weakened under moderate windshear.[42] It dissipated completely on 20 February.

On 28 March, an area of disturbed weather moved into the South-West Indian Ocean Basin, and the next day it was classified as Tropical Disturbance 08. The MFR expected it to intensify into a Moderate Tropical Storm at the start of April; however, increased shear took its toll, and it dissipated on 1 April.

Storm names[edit]

Within the South-west Indian Ocean Tropical Depressions and Subtropical Depressions that are judged to have 10-minute sustained windspeeds of 65 km/h, (40 mph) by the Regional Specialized Meteorological Center on La Réunion Island, France (RSMC La Réunion) are usually assigned a name. However it is the Sub-Regional Tropical Cyclone Advisory Centers in Mauritius and Madagascar who name the systems. The Sub-Regional Tropical Cyclone Advisory Center in Mauritius names the storm should it intensify into a moderate tropical storm between 55°E and 90°E, if the storm should intensify into a moderate tropical storm between 30°E and 55°E then the Sub-Regional Tropical Cyclone Advisory Center in Madagascar assigns the appropriate name to the storm. Tropical Cyclones moving into this region from the Australian Region are renamed by the Sub-Regional Tropical Cyclone Advisory Center in Mauritius, however tropical cyclones moving into the Australian region do not get renamed. New name lists are used every year, whilst a name is normally only used once so thus no names are retired.[43][44]

  • Abele
  • Bingiza
  • Cherono
  • Dalilou (unused)
  • Elvire (unused)
  • Francis (unused)
  • Giladi (unused)
  • Haingo (unused)
  • Igor (unused)
  • Jani (unused)
  • Khabonina (unused)
  • Lumbo (unused)
  • Maina (unused)
  • Naledi (unused)
  • Onani (unused)
  • Paulette (unused)
  • Qiloane (unused)
  • Rafael (unused)
  • Stella (unused)
  • Tari (unused)
  • Unjaty (unused)
  • Vita (unused)
  • Willy (unused)
  • Ximene (unused)
  • Yasmine (unused)
  • Zama (unused)

Season effects[edit]

This table lists all of the tropical cyclones and subtropical cyclones that were monitored during the 2010–2011 South-West Indian Ocean cyclone season. Information on their intensity, duration, name, areas affected, primarily comes from RSMC La Réunion. Death and damage reports come from either press reports or the relevant national disaster management agency while the damage totals are given in 2010 or 2011 USD.

Name Dates active Peak classification Sustained
windspeeds
Pressure Land areas affected Damage
(USD)
Deaths Refs
01 October 25 – 29 Tropical Depression 55 km/h (35 mph) 997 hPa (29.44 inHg) None None None
Abele November 29 – December 3 Tropical Cyclone 130 km/h (80 mph) 973 hPa (28.73 inHg) None None None
03 January 2 – 17 Tropical Depression 55 km/h (35 mph) 996 hPa (29.41 inHg) Madagascar None None
04 January 30 – 31 Tropical Disturbance 45 km/h (30 mph) 998 hPa (29.47 inHg) None None None
Bingiza February 8 – 18 Intense Tropical Cyclone 165 km/h (105 mph) 953 hPa (28.14 inHg) Comoros, Madagascar Unknown 34 [16]
06 February 15 – 20 Tropical Disturbance 45 km/h (30 mph) 1000 hPa (29.53 inHg) None None None
Cherono March 14 – 23 Moderate Tropical Storm 75 km/h (45 mph) 992 hPa (29.29 inHg) Rodrigues Island None None
08 March 29 – April 1 Tropical Disturbance 45 km/h (30 mph) 1004 hPa (29.65 inHg) None None None
09 April 13 – 16 Subtropical Depression 95 km/h (60 mph) 985 hPa (29.09 inHg) None None None
Season Aggregates
9 systems October 25 – April 16 165 km/h (105 mph) 953 hPa (28.14 inHg) Unknown 34


See also[edit]

References[edit]

  1. ^ "Report of RSMC La Reunion: 2010/2011 cyclone season". RA I Tropical Cyclone Committee for the South-West Indian Ocean (PDF) (Report) (20th ed.). Maputo, Mozambique: World Meteorological Organization. September 2012. Retrieved February 17, 2013. 
  2. ^ Dunputh, B. (26 October 2010). "Seasonal climate prediction — Summer 2010–2011 – Seasonal Outlook". Mauritius Meteorological Service. Retrieved 3 March 2011. 
  3. ^ Dunputh, B. (23 December 2010). "Seasonal climate prediction — Updated Summer 2010–11 Seasonal Outlook". Mauritius Meteorological Service. Retrieved 3 March 2011. 
  4. ^ "Meteo France Tropical Cyclone Advisory 01 for Tropical Disturbance 02". Météo-France. Retrieved 29 November 2010. 
  5. ^ "JTWC Tropical Cyclone 03S Warning 01". Joint Typhoon Warning Center. Retrieved 29 November 2010. 
  6. ^ "Meteo France Technical Bulletin 04 for Tropical Depression 02". Météo-France. Retrieved 29 November 2010. 
  7. ^ "Meteo France Technical Bulletin 09 for Tropical Storm Abele". Météo-France. Retrieved 1 December 2010. 
  8. ^ "Meteo France Technical Bulletin 10 for Tropical Storm Abele". Météo-France. Retrieved 1 December 2010. 
  9. ^ "Meteo France Technical Bulletin 13 for Tropical Cyclone Abele". Météo-France. Retrieved 2 December 2010. 
  10. ^ "JTWC Tropical Cyclone 03S Warning 08". Joint Typhoon Warning Center. Retrieved 3 December 2010. 
  11. ^ "JTWC Tropical Cyclone 03S Warning 09". Joint Typhoon Warning Center. Retrieved 3 December 2010. 
  12. ^ "Meteo France Technical Bulletin 15 for Tropical Cyclone Abele". Météo-France. Retrieved 3 December 2010. 
  13. ^ a b c "Bingiza: 06/02/2011 to 21/02/2011". Météo-France. 2015. Retrieved April 12, 2015. 
  14. ^ "Severe Tropical Storm 05 (Bingiza) Warning Number 14". Météo-France. February 12, 2011. Archived from the original on 12 February 2011. Retrieved April 12, 2015. 
  15. ^ "Overland Depression 05 (ex-Bingiza) Warning Number 35". Météo-France. February 17, 2011. Archived from the original on 17 February 2011. Retrieved April 12, 2015. 
  16. ^ a b "Reports of Members on significant/notable cyclones of the seasons". RA I Tropical Cyclone Committee for the South-West Indian Ocean (PDF) (Report) (20th ed.). Maputo, Mozambique: World Meteorological Organization. September 2012. pp. 8–10. Retrieved February 17, 2013. 
  17. ^ a b ACT Alliance (2011-03-18). "Madagascar: Assistance to people affected by Tropical Cyclone Bingiza- MDG111". ReliefWeb. Retrieved 2011-06-29. 
  18. ^ Integrated Regional Information Networks (2011-02-18). "Madagascar: Cyclone Bingiza's legacy". ReliefWeb. Retrieved 2011-06-29. 
  19. ^ "Meteo France Tropical Cyclone Advisory 01 for Tropical Disturbance 01". Météo-France. Retrieved 26 October 2010. 
  20. ^ "Meteo France Technical Bulletin 03 for Tropical Depression 01". Météo-France. Retrieved 26 October 2010. 
  21. ^ "JTWC Tropical Cyclone 01S Warning 01". Joint Typhoon Warning Center. Retrieved 26 October 2010. 
  22. ^ "Meteo France Technical Bulletin 09 for Tropical Depression 01". Météo-France. Retrieved 27 October 2010. 
  23. ^ "Meteo France Technical Bulletin 10 for Tropical Depression 01". Météo-France. Retrieved 27 October 2010. 
  24. ^ "JTWC Tropical Cyclone 01S Warning 05". Joint Typhoon Warning Center. Retrieved 27 October 2010. 
  25. ^ "FNMOC (Image) – Tropical Cyclone 01S having good convection even after weakening into a Tropical Depression". Fleet Numerical Meteorology and Oceanography Center. Retrieved 28 October 2010. 
  26. ^ "Tropical Cyclone 01S running out of convection". Fleet Numerical Meteorology and Oceanography Center. Retrieved 29 October 2010. 
  27. ^ "Meteo France Technical Bulletin 15 for Tropical Depression 01". Météo-France. Retrieved 29 October 2010. 
  28. ^ "Pre-Tropical Depression 03 imagery – December 28, 2010". FNMOC. Retrieved 5 January 2011. 
  29. ^ "Meteo France Tropical Cyclone Advisory 01 for Tropical Disturbance 03". Météo-France. Retrieved 2 January 2011. 
  30. ^ "Meteo France Technical Bulletin 2 for Tropical Depression 3". Météo-France. Retrieved 2 January 2011. 
  31. ^ "Meteo France Technical Bulletin 5 for Tropical Depression 3". Météo-France. Retrieved 4 January 2011. 
  32. ^ "Meteo France Technical Bulletin 6 for Tropical Depression 3". Météo-France. Retrieved 4 January 2011. 
  33. ^ "Tropical Depression 03's remnants imagery – January 4, 2011". FNMOC. Retrieved 5 January 2011. 
  34. ^ "Tropical Depression 03's remnants imagery – January 5, 2011". FNMOC. Retrieved 5 January 2011. 
  35. ^ "JTWC TCFA on Tropical Depression 03". Joint Typhoon Warning Center. Retrieved 16 January 2011. 
  36. ^ "Daily Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean". Météo-France. 16 January 2011. Retrieved 16 January 2011. 
  37. ^ "JTWC TCFA on Tropical Depression 03 (Withdrawn)". Joint Typhoon Warning Center. Retrieved 16 January 2011. 
  38. ^ "JTWC ABIO10 171800". Joint Typhoon Warning Center. Retrieved 18 January 2011. 
  39. ^ "Tropical Cyclone Technical Bulletin 1 for Tropical Disturbance 04". Météo-France. Retrieved 31 January 2011. 
  40. ^ "Tropical Cyclone Technical Bulletin 3 for Tropical Disturbance 04". Météo-France. Retrieved 31 January 2011. 
  41. ^ "Tropical Cyclone Warning 1 for Tropical Disturbance 06". Météo-France. Retrieved 15 February 2011. 
  42. ^ "Technical bulletin 3 for Tropical Disturbance 06". Météo-France. Retrieved 16 February 2011. 
  43. ^ Regional Association I Tropical Cyclone Committee (2006). "Tropical Cyclone Operational Plan for the South-West Indian Ocean" (PDF). World Meteorological Organization. Retrieved 14 December 2008. 
  44. ^ Regional Association I Tropical Cyclone Committee (2009). "FAQ: B5) What are the upcoming tropical cyclone names ?". Météo-France. Retrieved 6 June 2010. 

External links[edit]