2010–11 South-West Indian Ocean cyclone season

none January 2023 SWI 2011 2010-2011 South-West Indian Ocean cyclone season summary.png 25 October 2010 16 April 2011 Bingiza 957 85 10 9 6 (record low, tied with 1975–76) 3 (record low, tied with 1982–83) 2 16.26 34 total 2008–09, 2009–10, 2010–11 2011–12, 2012–13 2010–11 Australian region cyclone season 2010–11 South Pacific cyclone season The 2010–11 South-West Indian Ocean cyclone season was the least active cyclone season on record in the basin, tied with 1982–83, producing only three systems of gale intensity. This was due to cooler than normal water temperatures and the Walker circulation – a broad atmospheric circulation – causing unusually moist conditions in the eastern Indian Ocean and unusually dry conditions in the western Indian Ocean. The basin includes the waters of the ocean south of the equator and west of 90º E to the eastern coast of Africa. There were nine tropical or subtropical cyclones during the season, including five weak tropical disturbances or depressions, mostly in the northeastern portion of the basin or to the east of Madagascar. The first of these systems developed on 25 October 2010, which had its origins in the northeastern portion of the basin. On 29 November, the first named storm – Abele – also formed in the same area, strengthening to become one of the season's two tropical cyclones – storms with maximum sustained winds of at least 120 km/h mph on 5. The strongest system of the season was Cyclone Bingiza, which attained peak winds of 160 km/h mph on 5 off the northeastern coast of Madagascar in February. Bingiza was also the only storm to cause severe effects on land, causing heavy damage and 34 fatalities across Madagascar. Moderate Tropical Storm Cherono developed in March and traversed much of the ocean, only brushing by the island of Rodrigues. The final system was a subtropical depression that intensified south of Madagascar, becoming extratropical on 16 April to end the season. __TOC__ Season forecast and summary On 22 October 2010, the MMS released their seasonal outlook and predicted that there would be 8–10 named storms within the basin during the season.http://metservice.intnet.mu/?cat=47 Seasonal climate prediction — Summer 2010–2011 – Seasonal Outlook Dunputh B. 26 October 2010 Mauritius Meteorological Services 3 March 2011 dead https://web.archive.org/web/20110102021927/http://metservice.intnet.mu/?cat=47 2 January 2011 At the end of December, the MMS issued an updated seasonal outlook, predicting that only 6–8 named storms would develop.http://metservice.intnet.mu/?cat=47 Seasonal climate prediction — Updated Summer 2010–11 Seasonal Outlook Mauritius Meteorological Services 3 March 2011 Dunputh B. 23 December 2010 dead https://web.archive.org/web/20110102021927/http://metservice.intnet.mu/?cat=47 2 January 2011 As the season began, strong La Niña conditions persisted across the Pacific and Indian oceans, causing an increase in cyclonic flow near the equator over the Indian Ocean.Darwin Regional Specialised Meteorological Centre 29 11 November 2010 Darwin Tropical Diagnostic Statement 23 November 2015 http://www.bom.gov.au/climate/ntregion/statements/tropical/dtds-201011.pdf However, atmospheric conditions over the basin significantly decreased tropical cyclogenesis. The Walker circulation – a broad atmospheric circulation – caused unusually moist conditions in the eastern Indian Ocean while producing an increase in subsidence and unusually dry conditions in the western Indian Ocean. In addition, sea surface temperatures were below normal from 5°–15° S and west of 90° E, which limited storm formation near the Chagos Archipelago, typically a common area of formation. By the end of the season, there were only three named storms, the fewest in 50 years, although there was also a subtropical cyclone with gale-force winds that could have been named. In terms of total days in which cyclones were active, the season was slightly behind the 1982–83 season, thus making the 2010–11 season the second-quietest on record. The season also marked a global trend of decreasing tropical cyclone activity over the preceding five years, although the basin experienced a sudden shift toward increased activity in the subsequent season.World Meteorological Organization September 2012 7 December 2015 RA I Tropical Cyclone Committee for the South-West Indian Ocean 20th Maputo, Mozambique http://www.wmo.int/pages/prog/www/tcp/documents/ra1_tcc-20_final_report_en.pdf Météo-France's meteorological office in Réunion (MFR) – the official Regional Specialized Meteorological Center for the South-West Indian Ocean – tracked and named all tropical cyclones from the east coast of Africa to 90° E.Philippe Caroff June 2011 Operational procedures of TC satellite analysis at RSMC La Réunion World Meteorological Organization 22 April 2013 http://www.wmo.int/pages/prog/www/tcp/documents/RSMCLaReunionforIWSATC.pdf etal The Joint Typhoon Warning Center (JTWC), which is a joint United States Navy – United States Air Force task force that issues tropical cyclone warnings for the region,Joint Typhoon Warning Center Joint Typhoon Warning Center Mission Statement 2011 7 July 2012 https://metocph.nmci.navy.mil/jtwc/menu/JTWC_mission.html https://web.archive.org/web/20070726103400/https://metocph.nmci.navy.mil/jtwc/menu/JTWC_mission.html 26 July 2007 also issued advisories for storms during the season.Joint Typhoon Warning Center 71 2011 Annual Tropical Cyclone Report 2012 7 December 2015 http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/atcr/2011atcr.pdf 16 October 2012 https://web.archive.org/web/20121016232936/http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/atcr/2011atcr.pdf dead Systems Tropical Depression 01 SWI 25 October 29 October 01R_26_October_2010.jpg 01S 2010 path.png 30 35 997 For two days toward the end of October, an area of convection persisted within the equatorial trough, east-southeast of the Chagos Archipelago. With a ridge to the south, the system moved generally southwestward. Initially, strong wind shear exposed the circulation, although the system had good inflow from the south.Météo-France Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean 25 October 2010 8 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201010251045.html At 12:00 UTC on 25 October, the MFR designated the system as Tropical Disturbance 01,Météo-France Tropical Cyclone Advisory 01 for Tropical Disturbance 01 http://weather.noaa.gov/pub/data/raw/wt/wtio20.fmee..txt Météo-France 26 October 2010 live https://web.archive.org/web/20101203131139/http://weather.noaa.gov/pub/data/raw/wt/wtio20.fmee..txt 3 December 2010 and on the next day upgraded it to a tropical depression, estimating winds of 55 km/h mph on 5.26 October 2010 Météo-France Technical Bulletin 03 for Tropical Depression 01 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 26 October 2010 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 Also on 26 October, the JTWC classified the system as Tropical Cyclone 01S about 1,575 km (980 mi) east-southeast of Diego Garcia, estimating peak winds of 65 km/h mph on 5, or a minimal tropical storm. This followed a decrease in wind shear and an increase in convection over the center.Tropical Cyclone 01S (One) Warning NR 001 http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt Joint Typhoon Warning Center 8 December 2015 dead https://web.archive.org/web/20101203132409/http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt 3 December 2010 Persistent wind shear prevented the system from organizing, causing the thunderstorms to be removed from the center. The JTWC discontinued advisories on the cyclone on 27 October,Tropical Cyclone 01S (One) Warning NR 005 http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt Joint Typhoon Warning Center 8 December 2015 dead https://web.archive.org/web/20101203132409/http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt 3 December 2010 and on the same day the MFR downgraded it to a tropical disturbance.27 October 2010 Météo-France Technical Bulletin 10 for Tropical Depression 01 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 27 October 2010 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 On 29 October, the MFR issued their final advisory on the system.Météo-France Technical Bulletin 15 for Tropical Depression 01 29 October 2010 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 8 December 2015 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 The remnants continued to the west-southwest, occasionally producing thunderstorms through early November.Météo-France Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean 5 November 2010 8 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201011051000.html Tropical Cyclone Abele SWI 28 November 2 December (exited basin) Abele 2010-12-02 0820Z.jpg Abele_2010_path.png 70 80 974 On 23 November, an area of convection persisted southwest of Sumatra within the Intertropical Convergence Zone (ITCZ), accompanied by a poorly defined circulation.Météo-France Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean 23 November 2010 11 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201011231115.html Initially the system remained nearly stationary, although it began drifting to the southwest due to a weakness in the subtropical ridge. Decreasing wind shear and improved inflow favored further development.Météo-France Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean 26 November 2010 11 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201011261145.html On 28 November, the MFR designated the system as a zone of disturbed weather in the far northeastern portion of the basin.Abele : 28/11/2010 TO 05/12/2010 Météo-France 11 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/saisons_archivees/20102011/2010RE02.html Early the next day, the agency upgraded the system to Tropical Disturbance 02 after the convection organized further.Météo-France Technical Bulletin 01 for Tropical Disturbance 02 http://weather.noaa.gov/pub/data/raw/wt/wtio20.fmee..txt Météo-France 11 December 2015 live https://web.archive.org/web/20101203131139/http://weather.noaa.gov/pub/data/raw/wt/wtio20.fmee..txt 3 December 2010 Also on 29 November, the TCWC Perth classified the disturbance as Tropical Low 02U,29 November 2010 Tropical Cyclone Outlook Tropical Cyclone Warning Center Perth 11 December 2010 http://dynasmon.fortunecity.com/Perth.html dead https://web.archive.org/web/20090726132921/http://dynasmon.fortunecity.com/Perth.html 26 July 2009 and the JTWC designated it as Tropical Cyclone 03S about 1,295 km (805 mi) west of the Cocos (Keeling) Islands.29 November 2010 Tropical Cyclone 03S (Three) Warning NR 001 http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt Joint Typhoon Warning Center 29 November 2010 dead https://web.archive.org/web/20101203132409/http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt 3 December 2010 After the storm's development, the convection pulsed around the circulation, and was initially disrupted by wind shear in the region.30 November 2010 Tropical Cyclone 03S (Three) Warning NR 003 http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt Joint Typhoon Warning Center 11 December 2015 dead https://web.archive.org/web/20101203132409/http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt 3 December 2010 Despite the circulation being exposed from the thunderstorms, the MFR upgraded the disturbance to a depression on 30 November,Météo-France Technical Bulletin 04 for Tropical Depression 02 30 November 2010 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 11 December 2015 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 and further to Moderate Tropical Storm Abele on 1 December.1 December 2010 Météo-France Technical Bulletin 09 for Tropical Storm Abele http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 11 December 2015 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 By that time, the convection had consolidated over the center,1 December 2010 Tropical Cyclone 03S (Abele) Warning NR 006 http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt Joint Typhoon Warning Center 11 December 2015 dead https://web.archive.org/web/20101203132409/http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt 3 December 2010 which developed an eye amid lower wind shear.2 December 2010 Tropical Cyclone 03S (Abele) Warning NR 007 http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt Joint Typhoon Warning Center 11 December 2015 dead https://web.archive.org/web/20101203132409/http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt 3 December 2010 The MFR upgraded Abele to a severe tropical storm and later a tropical cyclone on 2 December, estimating peak 10 minute winds of 130 km/h mph on 5. The JTWC assessed 1 minute winds of 150 km/h mph on 5.Knapp, K. R. M. C. Kruk D. H. Levinson H. J. Diamond C. J. Neumann 2012 The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data 2011 Abele (2010331S07089) Bulletin of the American Meteorological Society 11 December 2015 http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-2010331S07089 https://web.archive.org/web/20151222140556/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-2010331S07089 22 December 2015 dead By that time, Abele had turned to the south and southeast ahead of an approaching trough.2 December 2010 Tropical Cyclone 03S (Abele) Warning NR 008 http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt Joint Typhoon Warning Center 11 December 2015 dead https://web.archive.org/web/20101203132409/http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt 3 December 2010 Cooler water temperatures and increased wind shear caused the convection to weaken, and the winds dropped accordingly.3 December 2010 Tropical Cyclone 03S (Abele) Warning NR 009 http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt Joint Typhoon Warning Center 11 December 2015 dead https://web.archive.org/web/20101203132409/http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt 3 December 2010 Late on 2 December, Abele crossed 90°E into the Australian region; the storm continued weakening and later became extratropical on 4 December, dissipating the next day. Tropical Depression 03 SWI 2 January 3 January 03R_2_January_2011.jpg 03R 2010 track.png 30 996 On December 28, the ITCZ spurred an increase in convection in the northeastern portion of the basin.Météo-France Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean 28 December 2010 13 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201012281100.html An elongated low-pressure area developed by 31 December, accompanied by intermittent thunderstorms. The system slowly consolidated, and the circulation center was exposed but well-defined.Joint Typhoon Warning Center 31 December 2010 13 December 2015 Significant Tropical Weather Advisory for the Western and South Pacific Oceans http://weather.noaa.gov/pub/data/raw/ab/abio10.pgtw..txt dead https://web.archive.org/web/20100808121248/http://weather.noaa.gov/pub/data/raw/ab/abio10.pgtw..txt 8 August 2010 Despite moderate wind shear, the convection organized into rainbands on the system's southern periphery.Joint Typhoon Warning Center 1 January 2011 13 December 2015 Significant Tropical Weather Advisory for the Western and South Pacific Oceans http://weather.noaa.gov/pub/data/raw/ab/abio10.pgtw..txt dead https://web.archive.org/web/20100808121248/http://weather.noaa.gov/pub/data/raw/ab/abio10.pgtw..txt 8 August 2010 On 2 January, the MFR classified the system as Tropical Disturbance 03,Météo-France Tropical Cyclone Advisory 01 for Tropical Disturbance 03 http://weather.noaa.gov/pub/data/raw/wt/wtio20.fmee..txt Météo-France 2 January 2011 live https://web.archive.org/web/20101203131139/http://weather.noaa.gov/pub/data/raw/wt/wtio20.fmee..txt 3 December 2010 and later that day upgraded it to a tropical depression.Météo-France Technical Bulletin 2 for Tropical Depression 3 http://dynasmon.fortunecity.com/ExtraWx.html 2 January 2011 Météo-France 2 January 2011 dead https://archive.today/20240522122752/https://www.webcitation.org/5vRPRCX8w?url=http://dynasmon.fortunecity.com/ExtraWx.html 22 May 2024 However, persistent shear caused the convection to diminish on 3 January, which exposed the circulation.Joint Typhoon Warning Center 3 January 2011 13 December 2015 Significant Tropical Weather Advisory for the Western and South Pacific Oceans http://weather.noaa.gov/pub/data/raw/ab/abio10.pgtw..txt dead https://web.archive.org/web/20100808121248/http://weather.noaa.gov/pub/data/raw/ab/abio10.pgtw..txt 8 August 2010 As a result, the MFR discontinued advisories on the system that day.Météo-France Technical Bulletin 6 for Tropical Depression 3 3 January 2011 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 4 January 2011 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 The remnants produced scattered convection while moving west-southwestward.Météo-France Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean 5 January 2011 13 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201101051200.html By 10 January, the circulation was still observed, although it was difficult to track.Météo-France Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean 10 January 2011 13 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201101101045.html Two days later, the system turned southward,Météo-France Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean 12 January 2011 13 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201101120945.html and by 15 January, the convection became more persistent as the system approached northeastern Madagascar.Météo-France Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean 15 January 2011 13 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201101151115.html That day, the JTWC issued a Tropical Cyclone Formation Alert based on the improved appearance on satellite imagery.Gary Padgett Monthly Global Tropical Cyclone Tracks January 2011 6 March 2011 13 December 2015 http://australiasevereweather.com/cyclones/2011/trak1101.htm At around 05:00 UTC on 16 January, the remnants of the depression struck Madagascar near Fenoarivo Atsinanana,Météo-France 16 January 2011 13 December 2015 Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/activiteope/bulletins/zcit/ZCITA_201101161100.html dead https://archive.today/20240522122714/https://www.webcitation.org/5vmeW7aBg?url=http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/activiteope/bulletins/zcit/ZCITA_201101161100.html 22 May 2024 and the system rapidly dissipated over land.Significant Tropical Weather Advisory for the Western and South Pacific Oceans http://weather.noaa.gov/pub/data/raw/ab/abio10.pgtw..txt Joint Typhoon Warning Center 18 January 2011 17 January 2011 dead https://web.archive.org/web/20100808121248/http://weather.noaa.gov/pub/data/raw/ab/abio10.pgtw..txt 8 August 2010 Tropical Cyclone Bingiza SWI 9 February 17 February Bingiza 13 February 2011.jpg Bingiza 2011 path.png 85 100 957 Cyclone Bingiza A zone of disturbed weather developed on 6 February well northeast of Madagascar. For the next few days, the system meandered southwestward, becoming Tropical Disturbance 05 on 8 February. By late the next day, the system had intensified into Moderate Tropical Storm Bingiza,Bingiza : 06/02/2011 TO 21/02/2011 Météo-France 13 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/saisons_archivees/20102011/2010RE05.html and the JTWC classified it as Tropical Cyclone 13S. After two days of meandering without strengthening, the storm turned to the southwest on 12 February due to a ridge to the south building toward Madagascar,Météo-France 12 February 2011 Moderate Tropical Storm 05 (Bingiza) Warning Number 12 28 June 2011 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 Later that day an eye became apparent on satellite imagery,Météo-France 12 February 2011 Severe Tropical Storm 05 (Bingiza) Warning Number 14 28 June 2011 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 and Bingiza intensified to tropical cyclone status. Early on 13 February, the cyclone attained peak 10 minute winds of 155 km/h mph on 5, and the JTWC estimated peak 1 minute winds of 185 km/h mph on 5. The cyclone moved ashore in northeastern Madagascar on 14 February and quickly weakened as it crossed the country. It emerged into the Mozambique Channel as a weak tropical disturbance, but almost immediately turned southward and moved ashore western Madagascar. The storm again reached open waters on 16 February, and briefly reintensified into a tropical storm. On 17 February, Bingiza made its final landfall near Morondava,Météo-France 17 February 2011 Overland Depression 05 (ex-Bingiza) Warning Number 35 12 April 2015 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 live and once again weakened over land. Late on 18 February the system reached open waters, which became extratropical two days later. Cyclone Bingiza was the only main storm to affect Madagascar during the season. It dropped heavy rainfall, peaking at 276.3 mm in on, in addition to the strong winds near the landfall point. In Vinanivao, located along the Masoala peninsula, the cyclone destroyed half of the buildings as well as the roads and bridges, leaving it only accessible by boat.Integrated Regional Information Networks 18 February 2011 Madagascar: Cyclone Bingiza's legacy ReliefWeb 29 June 2011 http://reliefweb.int/node/389071 The high winds caused heavy crop damage, including to rice and banana, which left minimal food supplies in some areas.CARE International ReliefWeb 18 February 2011 Situation alarmante à Madagascar : la région nord-est ravagée par le cyclone Bingiza 28 June 2011 http://reliefweb.int/node/389177 fr Overall, the cyclone destroyed 405.23 km2 (156.46 mi2) of rice fields, as well as 101.67 km2 (39.26 mi2) of other crops.ACT Alliance 18 March 2011 Madagascar: Assistance to people affected by Tropical Cyclone Bingiza- MDG111 ReliefWeb 29 June 2011 http://reliefweb.int/node/392511 Across its path, Bingiza destroyed 25,464 houses and damaged 36 schools,Integrated Regional Information Networks 24 February 2011 Madagascar: Picking up the pieces after Cyclone Bingiza 29 June 2011 ReliefWeb http://reliefweb.int/node/389660 and caused 34 deaths in the country. The storm's outer circulation also dropped heavy rainfall in the Comoros, peaking at 770 mm in on in the capital Moroni, and increased moist air over Malawi, Mozambique, and Tanzania. Moderate Tropical Storm Cherono SWI 13 March (Entered basin) 23 March Cherono Mar 17 2011.jpg Cherono 2011 path.png 40 45 993 On 10 March, Tropical Low 23U developed in the Australian basin southwest of Sumatra, and proceeded to move west.Tropical Cyclone three-day outlook for the Western Region 2011-03-11 10 March 2011 http://gwydir.demon.co.uk/advisories/IDW10800_201103110406.htm 11 March 2011 Bureau of Meteorology dead https://archive.today/20240521200034/https://www.webcitation.org/5x6uuFaIH?url=http://gwydir.demon.co.uk/advisories/IDW10800_201103110406.htm 21 May 2024 After crossing 90ºE, the MFR classified the system as a zone of disturbed weather late on 13 March,Cherono: 13/03/2011 TO 25/03/2011 Météo-France 14 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/saisons_archivees/20102011/2010RE07.html followed by an upgrade to Tropical Disturbance 07 on 14 March. The system had a poorly defined circulation but persistent convection, despite strong easterly wind shear.Météo-France Technical Bulletin 01 for Tropical Disturbance 07 14 March 2011 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 14 December 2015 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 By 16 March however, the shear had relaxed, allowing the convection to organize as the circulation became better defined. Good outflow and warm waters favored further intensification.Tropical Cyclone Formation Alert http://weather.noaa.gov/pub/data/raw/wt/wtxs21.pgtw..txt Joint Typhoon Warning Center 14 December 2015 16 March 2011 dead https://web.archive.org/web/20101203132608/http://weather.noaa.gov/pub/data/raw/wt/wtxs21.pgtw..txt 3 December 2010 At 00:00 UTC on 17 March, the MFR upgraded the system to a tropical depression, and a few hours later, the JTWC initiated advisories on the system as Tropical Cyclone 18S about 925 km (575 mi) southeast of Diego Garcia, an island in the central Indian Ocean.16 March 2011 Tropical Cyclone 18S (Eighteen) Warning NR 001 http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt Joint Typhoon Warning Center 14 December 2015 dead https://web.archive.org/web/20101203132409/http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt 3 December 2010 Gradually intensifying, the system moved steadily to the west-southwest, steered around the northern periphery of a ridge. Late on March 17, the MFR upgraded the depression to Moderate Tropical Storm Cherono. This marked the latest date for the third named storm of a season. On March 18, Cherono attained peak 10 minute winds of 75 km/h mph on 5 according to the MFR, and 1 minute winds of 85 km/h mph on 5 according to the JTWC. After that time, the circulation became exposed from the convection, affected by dry air in the region,Météo-France Technical Bulletin 14 for Moderate Tropical Storm Cherono 07 14 March 2011 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 14 December 2015 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 as well as increased wind shear.Météo-France Technical Bulletin 17 for Tropical Depression 07 (ex-Cherono) 19 March 2011 http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201103191303.htm Météo-France 14 December 2015 dead https://archive.today/20240522122955/https://www.webcitation.org/5xJEkQOry?url=http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201103191303.htm 22 May 2024 On 19 March, the JTWC discontinued advisories, and operationally the MFR downgraded the system to a tropical depression that day, although a post-season analysis indicated Cherono remained a moderate tropical storm for two more days. At 21:00 UTC on 19 March, the storm passed about 40 km (25 mi) south of Rodrigues island, producing winds of 31 km/h (20 mph).Météo-France Technical Bulletin 20 for Tropical Depression 07 (ex-Cherono) 19 March 2011 http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201103200042.htm Météo-France 14 December 2015 dead https://archive.today/20240522123032/https://www.webcitation.org/5xK0n74Ww?url=http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201103200042.htm 22 May 2024 The storm continued producing pulsing convection, increasing over the center on 20 March due to a temporary increase in wind shear.Météo-France Technical Bulletin 22 for Tropical Depression 07 (ex-Cherono) 20 March 2011 http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201103201241.htm Météo-France 14 December 2015 dead https://archive.today/20240522123117/https://www.webcitation.org/5xLYZXV1P?url=http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201103201241.htm 22 May 2024 However, the shear returned and the convection weakened on 21 March due to an approaching upper-level trough,Météo-France Technical Bulletin 25 for Tropical Depression 07 (ex-Cherono) 21 March 2011 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 14 December 2015 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 and Cherono weakened to tropical depression status. The same trough turned the storm to the south and southeast.Météo-France Technical Bulletin 27 for Tropical Depression 07 (ex-Cherono) 21 March 2011 http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201103211818.htm Météo-France 14 December 2015 dead https://archive.today/20240522123154/https://www.webcitation.org/5xNUqcNvc?url=http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201103211818.htm 22 May 2024 On 23 March, the system became extratropical as it curved eastward. The low weakened further the next day, dissipating on 25 March. Subtropical Depression 09 SWI 11 April 16 April 09R Apr 15 2011 1050Z.jpg 09R 2011 path.png subdepression 50 985 MFR A low-pressure area moved eastward from Mozambique over open waters on 9 April.Gary Padgett Monthly Global Tropical Cyclone Tracks April 2011 14 June 2011 14 December 2015 http://australiasevereweather.com/cyclones/2011/trak1104.htm Two days later, convection increased over the center while located about 40 km (25 mi) southeast of Tôlanaro, Madagascar, which recorded a drop in atmospheric pressure. Located in a baroclinic environment, the system was located beneath an upper-level low, resulting in an unusual structure. However, warm waters and low wind shear favored development.Météo-France Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean 11 April 2011 14 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201104111200.html Late on 11 April, the MFR classified the system as a zone of disturbed weather, and soon after designated it as a tropical disturbance.0920102011 : 11/04/2011 TO 16/04/2011 Météo-France 14 December 2015 http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/saisons_archivees/20102011/2010RE07.html On 13 April, the MFR reclassified the system as Subtropical Depression 09, about 360 km (220 mi) southeast of Fort Dauphin. The system's asymmetric structure – the strongest winds were located in a convective rainband to the south of the center – resulted in the subtropical designation.Météo-France Technical Bulletin 01 for Subtropical Depression 09 13 April 2011 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 15 December 2015 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 Late on 13 April, the system attained gale-force winds, although it remained an unnamed subtropical depression. The MFR later noted that the storm could have been named, but the agency decided against it due to the structure and the location. After moving clockwise, the storm began moving southwestward, steered by a ridge. The storm gradually intensified,Météo-France Technical Bulletin 05 for Subtropical Depression 09 14 April 2011 http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201104141301.htm Météo-France 15 December 2015 dead https://archive.today/20240522123229/https://www.webcitation.org/5xwhFCoTf?url=http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201104141301.htm 22 May 2024 and the convection increased around the center, although the wind field remained very large. Despite decreasing water temperatures,Météo-France Technical Bulletin 07 for Subtropical Depression 09 15 April 2011 http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201104150039.htm Météo-France 15 December 2015 dead https://archive.today/20240522123312/https://www.webcitation.org/5xxgKQKmu?url=http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201104150039.htm 22 May 2024 the storm attained peak 10 minute winds of 95 km/h mph on 5 on 15 April. That day, the system also developed a warm thermal core, similar in structure to a tropical cyclone.Météo-France Technical Bulletin 09 for Subtropical Depression 09 15 April 2011 http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201104151251.htm Météo-France 15 December 2015 dead https://archive.today/20240522123514/https://www.webcitation.org/5xyAmLha9?url=http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201104151251.htm 22 May 2024 Increased wind shear disrupted the convection, causing the storm to transition into an extratropical cyclone on 16 April.Météo-France Technical Bulletin 12 for Extratropical Depression 09 16 April 2011 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 15 December 2015 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 The system turned to the southeast and was absorbed by an approaching cold front on 17 April. Other systems The monsoon spawned a mesoscale convective system near Réunion on 28 January, with a weak circulation forming near the south coast of the island. Météo-France 28 January 2011 13 December 2015 Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201101281130.html The system dropped heavy rainfall over the island, reaching 400 mm in on in mountainous areas. The circulation moved southward away from Réunion, becoming increasingly defined. Météo-France 29 January 2011 13 December 2015 Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201101291200.html On January 30, the MFR classified the system as Tropical Disturbance 04.Tropical Cyclone Technical Bulletin 1 for Tropical Disturbance 04 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 30 January 2011 31 January 2011 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 However, the system soon weakened after it encountered cooler waters and stronger wind shear, and the MFR discontinued advisories early on 31 January.Tropical Cyclone Technical Bulletin 3 for Tropical Disturbance 04 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 31 January 2011 31 January 2011 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 By 2 February, the remnants of the disturbance became extratropical while accelerating to the southeast. Météo-France 2 February 2011 13 December 2015 Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201102021145.html On 14 February, a weak low was present north of Rodrigues island with disorganized convection due to easterly wind shear. Météo-France 14 February 2011 14 December 2015 Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201102141045.html By the following day, the convection had become more persistent, accompanied by a broad circulation.Significant Tropical Weather Advisory for the Western and South Pacific Oceans http://gwydir.demon.co.uk/advisories/ABIO10-PGTW_201102150930.htm Joint Typhoon Warning Center 14 December 2015 15 February 2011 dead https://archive.today/20240522122913/https://www.webcitation.org/5wWR2mmZv?url=http://gwydir.demon.co.uk/advisories/ABIO10-PGTW_201102150930.htm 22 May 2024 At 18:00 UTC on 15 February, the MFR classified the system as Tropical Disturbance 06 to the northeast of Réunion.Tropical Cyclone Warning 1 for Tropical Disturbance 06 http://weather.noaa.gov/pub/data/raw/wt/wtio20.fmee..txt 15 February 2011 Météo-France 15 February 2011 live https://web.archive.org/web/20101203131139/http://weather.noaa.gov/pub/data/raw/wt/wtio20.fmee..txt 3 December 2010 Continued wind shear prevented significant development,16 February 2011 Technical bulletin 3 for Tropical Disturbance 06 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 16 February 2011 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 and the system moved southward, developing intermittently strong convection.17 February 2011 Tropical Cyclone Warning 5 for Tropical Disturbance 06 https://listserv.illinois.edu/wa.cgi?A2%3Dind1102c%26L%3Dwx-tropl%26T%3D0%26X%3D558D791777B97BA4EA%26P%3D63179 https://archive.today/20240522122831/https://www.webcitation.org/5wao0Cst6?url=https://listserv.illinois.edu/wa.cgi%3FA2=ind1102c&L=wx-tropl&T=0&X=558D791777B97BA4EA&P=63179 dead 22 May 2024 Météo-France 16 February 2011 On 18 February, the MFR discontinued advisories,18 February 2011 Tropical Cyclone Warning 9 for Tropical Disturbance 06 http://weather.noaa.gov/pub/data/raw/wt/wtio20.fmee..txt Météo-France 16 February 2011 live https://web.archive.org/web/20101203131139/http://weather.noaa.gov/pub/data/raw/wt/wtio20.fmee..txt 3 December 2010 although the remnant circulation persisted for several more days. Météo-France 20 February 2011 14 December 2015 Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201102201100.html Toward the end of March, the ITCZ produced an increase in convection in the Australian basin, accompanied by a disorganized center. The system moved westward over an area of warm water temperatures, Météo-France 28 March 2011 14 December 2015 Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201103281145.html and after crossing 90ºE into the basin, the MFR classified it as Tropical Disturbance 08 on 29 March after the convection organized more.29 March 2011 Technical bulletin 1 for Tropical Disturbance 08 http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201103290056.htm Météo-France 16 February 2011 dead https://archive.today/20240522123352/https://www.webcitation.org/5xY2x7r8J?url=http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201103290056.htm 22 May 2024 The circulation became better defined, and the MFR anticipated that the system would eventually intensify into a severe tropical storm.29 March 2011 Technical bulletin 2 for Tropical Disturbance 08 http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201103290641.htm Météo-France 16 February 2011 dead https://archive.today/20240522123430/https://www.webcitation.org/5xY2ywsqd?url=http://gwydir.demon.co.uk/advisories/WTIO30-FMEE_201103290641.htm 22 May 2024 However, poor inflow and unfavorable wind shear prevented the system from organizing,30 March 2011 Technical bulletin 2 for Tropical Disturbance 08 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 16 February 2011 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 and the MFR discontinued advisories on March 31 after the circulation remained exposed from the convection.31 March 2011 Technical bulletin 6 for Tropical Disturbance 08 http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt Météo-France 16 February 2011 live https://web.archive.org/web/20101203130446/http://weather.noaa.gov/pub/data/raw/wt/wtio30.fmee..txt 3 December 2010 The circulation persisted for a few more days before becoming poorly defined on 4 April. Météo-France 4 April 2011 14 December 2015 Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/archives/bulletins/zcit/20102011/ZCITA_201104041200.html Storm names 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.2006 Tropical Cyclone Operational Plan for the South-West Indian Ocean 14 December 2008 Regional Association I Tropical Cyclone Committee World Meteorological Organization http://www.wmo.ch/pages/prog/www/tcp/documents/TCP12Edition2006-English.pdf 25 February 2009 https://web.archive.org/web/20090225212829/http://www.wmo.ch/pages/prog/www/tcp/documents/TCP12Edition2006-English.pdf dead2009 FAQ: B5) What are the upcoming tropical cyclone names ? 6 June 2010 Regional Association I Tropical Cyclone Committee Météo-France http://www.meteo.fr/temps/domtom/La_Reunion/webcmrs9.0/anglais/faq/FAQ_Ang_B.html Abele Bingiza Cherono Dalilou Elvire Francis Giladi Haingo Igor Jani Khabonina Lumbo Maina Naledi Onani Paulette Qiloane Rafael Stella Tari Unjaty Vita Willy Ximene Yasmine Zama Season effects 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. |- | 01 || 25–29 October || bgcolor=#TD|1 Tropical Depression || bgcolor=#TD|55 55 km/h mph on 5 || bgcolor=#TD|0997 997 hPa inHg 4 on || None || None || None || |- | Abele || 28 November – 3 December || bgcolor=#TC|4 Tropical Cyclone || bgcolor=#TC|130 130 km/h mph on 5 || bgcolor=#TC|0974 974 hPa inHg 4 on || None || None || None || |- | 03 || 2–3 January || bgcolor=#TD|1 Tropical Depression || bgcolor=#TD|55 55 km/h mph on 5 || bgcolor=#TD|0996 996 hPa inHg 4 on || Madagascar || None || None || |- | 04 || 30–31 January || bgcolor=#DI|0 Tropical Disturbance || bgcolor=#DI|45 45 km/h mph on 5 || bgcolor=#DI|0998 998 hPa inHg 4 on || Réunion || None || None || |- | Bingiza || 9–17 February || bgcolor=#TC|4 Tropical Cyclone || bgcolor=#TC|155 155 km/h mph on 5 || bgcolor=#TC|0957 957 hPa inHg 4 on || Comoros, Madagascar || Unknown || 34 || |- | 06 || 15–18 February || bgcolor=#DI|0 Tropical Disturbance || bgcolor=#DI|45 45 km/h mph on 5 || bgcolor=#DI|1000 1000 hPa inHg 4 on || None || None || None || |- | Cherono || 13–23 March || bgcolor=#TS|2 Moderate Tropical Storm || bgcolor=#TS|075 75 km/h mph on 5 || bgcolor=#TS|0993 993 hPa inHg 4 on || Rodrigues Island || None || None || |- | 08 || 29–31 March || bgcolor=#DI|0 Tropical Disturbance || bgcolor=#DI|045 45 km/h mph on 5 || bgcolor=#DI|1004 1004 hPa inHg 4 on || None || None || None || |- | 09 || 13–16 April || bgcolor=#TD|2 Subtropical Depression || bgcolor=#TD|095 95 km/h mph on 5 || bgcolor=#TD|0985 985 hPa inHg 4 on || None || None || None || |- 9 systems 25 October – 16 April 155 km/h mph on 5 957 hPa inHg 4 on Unknown 34 See also Tropical cyclones Tropical cyclones in 2010 and 2011 South-West Indian Ocean tropical cyclone List of Southern Hemisphere cyclone seasons Atlantic hurricane seasons: 2010, 2011 Pacific hurricane seasons: 2010, 2011 Pacific typhoon seasons: 2010, 2011 North Indian Ocean cyclone seasons: 2010, 2011 South Atlantic tropical cyclone References 30em External links Joint Typhoon Warning Center (JTWC). Météo France (RSMC La Réunion). World Meteorological Organization 2010 y 2010 South-West Indian Ocean cyclone yes Category:Articles which contain graphical timelines Category:South-West Indian Ocean cyclone seasons 2010 SWIO 2011 SWIO