2009–10 South-West Indian Ocean cyclone season
Encyclopedia
The 2009–10 South-West Indian Ocean tropical cyclone year officially started on July 1, 2009, and ended on June 30, 2010, after incorporating the tropical cyclone
season which ran from November 1 to April 30 for all areas except for Mauritius
and the Seychelles
, for which it ended on May 15, 2010. In this basin which officially runs from 30 to 90E and is to the south of the equator, the main warning center is the Regional Specialized Meteorological Center
on La Reunion Island; however they delegate the naming of Cyclones to the Meteorological services of Mauritius and Madagascar.
It was predicted by the Mauritius Meteorological service that there would be between nine and eleven named storms in the South West Indian Ocean during the season. Their further assessment that there was a good probability of a named storm forming in November was justified when Tropical Cyclone Anja formed on November 14.
in Indonesia. Satellite imagery was showing that the convection was slowly starting to consolidate with a well defined low level circulation centre off the western coast of Sumatra. However it was not expected to develop any further due to being in area of high vertical wind shear in excess of 40 knots (78.4 km/h). Despite this it was designated as a tropical low early the next day by TCWC Perth. The JTWC then declared early the next day that the disturbance had dissipated as it crossed 90E and moved into RSMC La Reunion's area of responsibility. TCWC Perth continued to monitor the tropical low as it slowly developed further until early on September 20 when RSMC La Reunion designated it as the second Zone of Disturbed Weather of the 2009–10 as convection had developed over the system and the amount of vertical wind shear over the system had dropped. However they released their final advisory later that day as convection had dissipated in the northern quadrants of the system.
. Throughout that day, and into the 15th, Anja rapidly intensified from a severe tropical storm to a tropical cyclone on the MFR scale and a Category 3-equivalent cyclone on the Saffir-Simpson Hurricane Scale
(SSHS), while remaining well away from land. The system displayed annular characteristics
and was very small; its diameter was 60 nautical miles (111.1 km) and it displayed a pinhole eye. The storm peaked at a Category 3-equivalent intensity and held its strength until November 17 when the storm rapidly weakened to a tropical storm. Final advisories were issued on November 18 as the system weakened to a depression and became extratropical.
. The next day it strengthened to a Moderate Tropical Storm and was named 'Bongani'. On November 23–24, The system remained small sized and was undergoing a temporarly southeasterly constraint. According to CIMSS data (MIMIC-TPW) the dry air that was to the southwest of the system interfered with circulation of the system and temporarily limited the intensification rate. On the morning of November 24, Bongani rapidly weakened into a tropical disturbance.
The remnants of Bongani brought unsettled weather to the Mayotte
Islands. Moderate rains affected the region between November 26 and 27; waves associated with the storm also averaged 3 m (9.8 ft) along coastal areas with some reaching 6 m (19.7 ft). In the nearby Comoros
Islands, waves were similarly high, with the highest reaching 5 m (16.4 ft).
(SSHS). It sustained this strength for a day peaked at a Category 4-equivalent intensity and held its strength as a high strong category 4-equivalent, then on the 10th slowly weakened to a category 2 equivalent cyclone. The weakening continued steadily, and the final advisory was issued on December 12 when the remnants were 370 miles (595.5 km) north of Rodrigues
. Later that day, the remnants of Ex-Cleo regenerated to a tropical depression, but it weakened to a tropical disturbance and dissipated on December 14.
It continued to organize throughout the next day, and by the 21st of December it was named Moderate Tropical Storm David by the Mauritius Meteorological Service. It then reversed its direction of motion and headed east-southeast while strengthening to a Severe Tropical Storm. Its strength fluctuated for the next few days, and by Christmas Day it was moving very little and windshear weakened it to a Tropical Disturbance. The final advisory from the RSMC was issued on December 25, although the remnant continued to produce bursts of poorly organized convection for several days as it reversed direction again and headed west.
In post-season analysis, David was downgraded to a Moderate Tropical Storm as winds were reassessed to have never exceeded 85 km/h (50 mph).
On December 29, the remnants of David brought heavy rain to the islands of Mauritius
and Réunion
. Most of Mauritius recorded over 100 mm (3.9 in) of rain within a 24-hour span, with a maximum of 146.2 mm (5.8 in) in Mon Loisir Rouillard. Widespread flash flooding took place across the island, resulting in over 20 calls to firefighters for rescue. Officials deployed special mobile forces in several cities due to the risk of increased flooding.
around 8 January, moved across northern Madagascar
and into the Indian Ocean where it displayed occasional bursts of convection. On 15 January the LLCC improved in organisation, and the RSMC designated it as a Tropical Disturbance 245 nmi (453.7 km) to the west-southwest of La Réunion. The next day, RSMC La Reunion issued their final advisory on the system as the center was ill-defined.
. Next day this was raised to a Tropical Disturbance, and JTWC designated is as Tropical Cyclone 11S based on 1-minute wind strength. By January 29 it displayed hybrid characteristics and was classified as a subtropical depression, although the maximum winds reached storm strength.
. On February 2 it strengthened to a Moderate Tropical Storm and was named Fami. Shortly after this it made landfall on the western Malagasy coast and weakened rapidly to a depression. Fami dissipated on February 2.
. Hours later it was classified as Moderate Tropical Storm Gelane. It reached Tropical Cyclone strength briefly on February 17, but quickly weakened to a Severe Tropical Storm. Then on February 18, it restrengthened back into a Tropical Cyclone, eventually becoming an Intense Tropical Cyclone. It remained a small system and weakened rapidly as wind shear effects increased.
coast, and made landfall north of Mananjary
. At least ten people were killed by the storm and 32,000 others were affected throughout Madagascar. Later reports confirmed that four other people had been killed and two more were missing. Nearly 38,000 people were left homeless by flooding triggered by torrential rains from the storm.
In post-season analysis, Joel was discovered to have briefly been a tropical storm before transitioning into a subtropical cyclone.
assigns the appropriate name to the storm. If it reaches moderate tropical storm strength between 55°E and 90°E, then the Sub-Regional Tropical Cyclone Advisory Centre in Mauritius
names the storm. A new list of names is drawn up and used each year, so no names are retired. The names for this season are as follows:
. The damage figures are all from 2009 USD.
Tropical cyclone
A tropical cyclone is a storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rain. Tropical cyclones strengthen when water evaporated from the ocean is released as the saturated air rises, resulting in condensation of water vapor...
season which ran from November 1 to April 30 for all areas except for Mauritius
Mauritius
Mauritius , officially the Republic of Mauritius is an island nation off the southeast coast of the African continent in the southwest Indian Ocean, about east of Madagascar...
and the Seychelles
Seychelles
Seychelles , officially the Republic of Seychelles , is an island country spanning an archipelago of 115 islands in the Indian Ocean, some east of mainland Africa, northeast of the island of Madagascar....
, for which it ended on May 15, 2010. In this basin which officially runs from 30 to 90E and is to the south of the equator, the main warning center is the Regional Specialized Meteorological Center
Regional Specialized Meteorological Center
A Regional Specialized Meteorological Centre is responsible for the distribution of information, advisories, and warnings regarding the specific program they have a part of, agreed by consensus at the World Meteorological Organization as part of the World Weather Watch.-Tropical...
on La Reunion Island; however they delegate the naming of Cyclones to the Meteorological services of Mauritius and Madagascar.
It was predicted by the Mauritius Meteorological service that there would be between nine and eleven named storms in the South West Indian Ocean during the season. Their further assessment that there was a good probability of a named storm forming in November was justified when Tropical Cyclone Anja formed on November 14.
Tropical Disturbance 01
Early on August 17, the JTWC reported that an area of disturbed weather had formed about 1200 kilometres, (750 miles), to the east of Diego Garcia. The convection had a developed low level circulation center, however convection had not started to consolidate around it and was in an area of strong vertical wind shear. During that day the disturbance gradually developed further as the environment around it gradually improved and was designated as Tropical Disturbance 01 by RSMC La Reunion early the next day. However later that day they downgraded it to a zone of disturbed weather and released their final advisory on the disturbance as it had remained weak with the low level circulation center remaining weak and exposed. Over the next few days it weakened further before dissipating on August 20.Zone of Disturbed Weather 02
During September 17, both TCWC Jakarta and the JTWC reported that an area of convection had persisted about 740 km (459.8 mi), to the south east of SumatraSumatra
Sumatra is an island in western Indonesia, westernmost of the Sunda Islands. It is the largest island entirely in Indonesia , and the sixth largest island in the world at 473,481 km2 with a population of 50,365,538...
in Indonesia. Satellite imagery was showing that the convection was slowly starting to consolidate with a well defined low level circulation centre off the western coast of Sumatra. However it was not expected to develop any further due to being in area of high vertical wind shear in excess of 40 knots (78.4 km/h). Despite this it was designated as a tropical low early the next day by TCWC Perth. The JTWC then declared early the next day that the disturbance had dissipated as it crossed 90E and moved into RSMC La Reunion's area of responsibility. TCWC Perth continued to monitor the tropical low as it slowly developed further until early on September 20 when RSMC La Reunion designated it as the second Zone of Disturbed Weather of the 2009–10 as convection had developed over the system and the amount of vertical wind shear over the system had dropped. However they released their final advisory later that day as convection had dissipated in the northern quadrants of the system.
Tropical Disturbance 03
Early on November 7, the JTWC issued a Tropical Cyclone Formation Alert on a system north of Diego Garcia. Later that day, RSMC La Reunion upgraded the system to a tropical disturbance. Despite forecasts that the system would strengthen to a depression, it was substantially affected by shear, and as a result, the JTWC cancelled their TCFA on November 9.Tropical Cyclone Anja
RSMC La Reunion commenced advisories on Tropical Disturbance 04 on November 14, raising the status to a Tropical Depression later the same day. At the time of formation, it was some 390 mi (627.6 km) south of Diego GarciaDiego Garcia
Diego Garcia is a tropical, footprint-shaped coral atoll located south of the equator in the central Indian Ocean at 7 degrees, 26 minutes south latitude. It is part of the British Indian Ocean Territory [BIOT] and is positioned at 72°23' east longitude....
. Throughout that day, and into the 15th, Anja rapidly intensified from a severe tropical storm to a tropical cyclone on the MFR scale and a Category 3-equivalent cyclone on the Saffir-Simpson Hurricane Scale
Saffir-Simpson Hurricane Scale
The Saffir–Simpson Hurricane Scale , or the Saffir–Simpson Hurricane Wind Scale , classifies hurricanes — Western Hemisphere tropical cyclones that exceed the intensities of tropical depressions and tropical storms — into five categories distinguished by the intensities of their sustained winds...
(SSHS), while remaining well away from land. The system displayed annular characteristics
Annular hurricane
An annular hurricane, also known as a truck tire or doughnut hurricane, is a tropical cyclone in the Atlantic or Eastern Pacific Oceans that features a large, symmetric eye surrounded by a thick ring of intense convection. This type of storm is not prone to the fluctuations in intensity associated...
and was very small; its diameter was 60 nautical miles (111.1 km) and it displayed a pinhole eye. The storm peaked at a Category 3-equivalent intensity and held its strength until November 17 when the storm rapidly weakened to a tropical storm. Final advisories were issued on November 18 as the system weakened to a depression and became extratropical.
Moderate Tropical Storm Bongani
On November 22, RSMC La Reunion commenced issuing advisories for Tropical Disturbance 05 about 500 mi (804.7 km) northeast of MadagascarMadagascar
The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...
. The next day it strengthened to a Moderate Tropical Storm and was named 'Bongani'. On November 23–24, The system remained small sized and was undergoing a temporarly southeasterly constraint. According to CIMSS data (MIMIC-TPW) the dry air that was to the southwest of the system interfered with circulation of the system and temporarily limited the intensification rate. On the morning of November 24, Bongani rapidly weakened into a tropical disturbance.
The remnants of Bongani brought unsettled weather to the Mayotte
Mayotte
Mayotte is an overseas department and region of France consisting of a main island, Grande-Terre , a smaller island, Petite-Terre , and several islets around these two. The archipelago is located in the northern Mozambique Channel in the Indian Ocean, namely between northwestern Madagascar and...
Islands. Moderate rains affected the region between November 26 and 27; waves associated with the storm also averaged 3 m (9.8 ft) along coastal areas with some reaching 6 m (19.7 ft). In the nearby Comoros
Comoros
The Comoros , officially the Union of the Comoros is an archipelago island nation in the Indian Ocean, located off the eastern coast of Africa, on the northern end of the Mozambique Channel, between northeastern Mozambique and northwestern Madagascar...
Islands, waves were similarly high, with the highest reaching 5 m (16.4 ft).
Intense Tropical Cyclone Cleo
On December 6, a strong tropical disturbance 06 newly formed in the central Indian Ocean. The storm was expected to strengthen slowly, however, the next day, the disturbance strengthened into a severe tropical storm while being given a designation as Tropical Cyclone 03S by the JTWC. On 8 December it strengthened rapidly to become the first Intense Tropical Cyclone of the season and a Category 4-equivalent cyclone on the Saffir-Simpson Hurricane ScaleSaffir-Simpson Hurricane Scale
The Saffir–Simpson Hurricane Scale , or the Saffir–Simpson Hurricane Wind Scale , classifies hurricanes — Western Hemisphere tropical cyclones that exceed the intensities of tropical depressions and tropical storms — into five categories distinguished by the intensities of their sustained winds...
(SSHS). It sustained this strength for a day peaked at a Category 4-equivalent intensity and held its strength as a high strong category 4-equivalent, then on the 10th slowly weakened to a category 2 equivalent cyclone. The weakening continued steadily, and the final advisory was issued on December 12 when the remnants were 370 miles (595.5 km) north of Rodrigues
Rodrigues
Rodrigues is a common surname in the Portuguese language. It was originally a Patronymic, meaning Son of Rodrigo or Son of Rui. The "es" signifies "son of". The name Rodrigo is the Portuguese form of Roderick, meaning "famous power" or "famous ruler", from the Germanic elements "hrod" and "ric" ,...
. Later that day, the remnants of Ex-Cleo regenerated to a tropical depression, but it weakened to a tropical disturbance and dissipated on December 14.
Moderate Tropical Storm David
On December 12, a zone of disturbed weather formed in the Southern Indian Ocean near the border with the Australian sector. The next day the RSMC classified it as Tropical Disturbance 07, and JTWC as Tropical Cyclone 05S, but its movement to cooler water and higher levels of wind shear weakened the tropical system on the 14th. The remnants continued to show a Low level Circulation Centre accompanied by flaring convection as they headed west or northwest, and the organisation began to improve again on the 19th.It continued to organize throughout the next day, and by the 21st of December it was named Moderate Tropical Storm David by the Mauritius Meteorological Service. It then reversed its direction of motion and headed east-southeast while strengthening to a Severe Tropical Storm. Its strength fluctuated for the next few days, and by Christmas Day it was moving very little and windshear weakened it to a Tropical Disturbance. The final advisory from the RSMC was issued on December 25, although the remnant continued to produce bursts of poorly organized convection for several days as it reversed direction again and headed west.
In post-season analysis, David was downgraded to a Moderate Tropical Storm as winds were reassessed to have never exceeded 85 km/h (50 mph).
On December 29, the remnants of David brought heavy rain to the islands of Mauritius
Mauritius
Mauritius , officially the Republic of Mauritius is an island nation off the southeast coast of the African continent in the southwest Indian Ocean, about east of Madagascar...
and Réunion
Réunion
Réunion is a French island with a population of about 800,000 located in the Indian Ocean, east of Madagascar, about south west of Mauritius, the nearest island.Administratively, Réunion is one of the overseas departments of France...
. Most of Mauritius recorded over 100 mm (3.9 in) of rain within a 24-hour span, with a maximum of 146.2 mm (5.8 in) in Mon Loisir Rouillard. Widespread flash flooding took place across the island, resulting in over 20 calls to firefighters for rescue. Officials deployed special mobile forces in several cities due to the risk of increased flooding.
Very Intense Tropical Cyclone Edzani
Tropical Low 03U of the Australian Region crossed the 90ºE meridian on 4 January and was designated Tropical Disturbance 8 by RSMC La Réunion. The system showed two low-level circulation centres for a while, but on 5 January these consolidated, and the combination was upgraded to a Tropical Depression. At 0300 UTC on January 6, the JTWC starts issuing advisories designating the system as 07S, and shortly thereafter the RSMC upgraded it to Moderate Tropical Storm Edzani. Early on January 7, RSMC La Reunion upgraded Edzani to a Severe Tropical Storm, and it strengthened rapidly throughout the day to become an Intense Tropical Cyclone. The next day it became a Very Intense Tropical Cyclone and category 5 by JTWC, the first since Juliet in April 2005. On January 9, Edzani was downgraded to an Intense Tropical Cyclone due to decreasing sea surface temperatures. It continued to weaken during the day, as sea surface temperatures continued to decrease. By January 10, it was only a Tropical Cyclone, and within the next few days it weakened to Moderate Tropical Storm strength. The RSMC classified it as an subtropical cyclone by January 12, although JTWC treated it as tropical for 2 days longer.Tropical Disturbance 09
An area of disturbed weather, first observed over the Mozambique ChannelMozambique Channel
The Mozambique Channel is a portion of the Indian Ocean located between the island nation of Madagascar and southeast Africa, primarily the country of Mozambique. It was a World War II clashpoint during the Battle of Madagascar...
around 8 January, moved across northern Madagascar
Madagascar
The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...
and into the Indian Ocean where it displayed occasional bursts of convection. On 15 January the LLCC improved in organisation, and the RSMC designated it as a Tropical Disturbance 245 nmi (453.7 km) to the west-southwest of La Réunion. The next day, RSMC La Reunion issued their final advisory on the system as the center was ill-defined.
Subtropical Storm 10
On January 26, RSMC La Réunion announced that a Zone of Disturbed Weather had formed about 350 miles (563.3 km) NNE of MauritiusMauritius
Mauritius , officially the Republic of Mauritius is an island nation off the southeast coast of the African continent in the southwest Indian Ocean, about east of Madagascar...
. Next day this was raised to a Tropical Disturbance, and JTWC designated is as Tropical Cyclone 11S based on 1-minute wind strength. By January 29 it displayed hybrid characteristics and was classified as a subtropical depression, although the maximum winds reached storm strength.
Moderate Tropical Storm Fami
On February 1, RSMC La Reunion commenced issuing advisories for Tropical Disturbance 11 in the Mozambique ChannelMozambique Channel
The Mozambique Channel is a portion of the Indian Ocean located between the island nation of Madagascar and southeast Africa, primarily the country of Mozambique. It was a World War II clashpoint during the Battle of Madagascar...
. On February 2 it strengthened to a Moderate Tropical Storm and was named Fami. Shortly after this it made landfall on the western Malagasy coast and weakened rapidly to a depression. Fami dissipated on February 2.
Intense Tropical Cyclone Gelane
On February 15, the RSMC announced the formation of Tropical Disturbance 12 aprroximately 650 nmi (1,203.8 km) NNE of La RéunionLa Reunion
La Reunion may refer to:* La Reunion , a communal settlement near present-day Dallas, Texas*La Réunion, Lot-et-Garonne, a town in the Lot-et-Garonne department of France*Réunion, an island in the Indian Ocean east of Madagascar...
. Hours later it was classified as Moderate Tropical Storm Gelane. It reached Tropical Cyclone strength briefly on February 17, but quickly weakened to a Severe Tropical Storm. Then on February 18, it restrengthened back into a Tropical Cyclone, eventually becoming an Intense Tropical Cyclone. It remained a small system and weakened rapidly as wind shear effects increased.
Severe Tropical Storm Hubert
On March 9, a tropical disturbance formed between Madagascar and Réunion. On March 10 it strengthened to a tropical storm and was named Hubert by the meteorological service of Madagascar. It strengthened to a severe tropical storm as it approached the MadagascarMadagascar
The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...
coast, and made landfall north of Mananjary
Mananjary, Fianarantsoa
Mananjary is a fivondronana located in Vatovavy-Fitovinany Region in Madagascar. The region has a total population of 233,697 ....
. At least ten people were killed by the storm and 32,000 others were affected throughout Madagascar. Later reports confirmed that four other people had been killed and two more were missing. Nearly 38,000 people were left homeless by flooding triggered by torrential rains from the storm.
Tropical Cyclone Imani
Tropical Disturbance 14 formed on 22 March in the far east of the SW Indian Ocean basin, close to 90ºE. Although the precursor disturbance had been drifting eastwards, TD 14 was predicted to remain in this basin and not move into the Australian. It became a tropical depression later the same day, and was upgraded to Moderate Tropical Storm Imani on 23 March and a Severe Tropical Storm the next day. It continued to strengthen as it moved southwards, and reached tropical cyclone strength on 25 March. It started to dissipate on March 26, and La Reunion had stopped releasing advisories on Imani at 1200z, March 26.Tropical Depression 15 (Robyn)
The remnants of Severe Tropical Cyclone Robyn crossed into this basin on 7 April as a Filling Depression, and a single advisory was issued by RSMC La Réunion.Subtropical Storm Joel
An area of convection southwest of Madagascar was designated Subtropical Depression 16 by RSMC La Reunion on 26 May. The small system strengthened rapidly and was soon named Joel, although still classified as a Subtropical Depression. NASA also considered the storm to have been subtropical, attaining peak one-minute sustained winds of 85 km/h (50 mph).In post-season analysis, Joel was discovered to have briefly been a tropical storm before transitioning into a subtropical cyclone.
Storm Names
Tropical disturbances are named upon reaching moderate tropical storm strength. If a tropical disturbance reaches this intensity west of 55°E, then the Sub-Regional Tropical Cyclone Advisory Centre in MadagascarMadagascar
The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...
assigns the appropriate name to the storm. If it reaches moderate tropical storm strength between 55°E and 90°E, then the Sub-Regional Tropical Cyclone Advisory Centre in Mauritius
Mauritius
Mauritius , officially the Republic of Mauritius is an island nation off the southeast coast of the African continent in the southwest Indian Ocean, about east of Madagascar...
names the storm. A new list of names is drawn up and used each year, so no names are retired. The names for this season are as follows:
|
|
Season effects
This table lists all the storms that developed in the Southern Hemisphere during the 2009–2010 South-West Indian Ocean cyclone season. It includes their intensity, duration, name, landfalls, deaths, and damages. All data is taken from Météo-FranceMétéo-France
Météo-France is the French national meteorological service.The organisation was established by decree in June 1993 and is a department of the Ministry of Transportation. It is headquartered in Paris but many domestic operations have been decentralised to Toulouse...
. The damage figures are all from 2009 USD.
| RSMC/JTWC Number | Storm Name | Dates active | Storm category at peak intensity | Peak 10-min sustained winds | Pressure hPa | Areas affected | Damage (USD) | Deaths | August 18 | 2 Tropical Disturbance | 3535 km/h (20 mph) | 1004 | None | None | None |
|---|---|---|---|---|---|---|---|---|---|
| 02 | N/A | September 18 – September 20 | 1 Zone of Disturbed Weather | 3535 km/h (20 mph) | 1008 | None | None | None | |
| 03 | N/A | September 18 – September 20 | 2 Tropical Disturbance | 4545 km/h (30 mph) | 1002 | None | None | None | |
| 04/01S | 1 Anja | November 14 – November 18 | 6 Tropical Cyclone | 155 155 km/h (100 mph) | 950 | None | None | None | |
| 05/02S | 2 Bongani | November 22 – November 25 | 4 Moderate tropical storm | 75 75 km/h (45 mph) | 997 | Madagascar | |||
| 06/03S | 3 Cleo | December 6 – December 14 | 7 Intense tropical cyclone | 195 195 km/h (120 mph) | 925 | None | None | None | |
| 07/05S | 4 David | December 12 – December 25 | 4 Moderate tropical storm | 85 85 km/h (50 mph) | 987 | Reunion, Mauritius, Madagascar | |||
| 08/07S | 5 Edzani | January 4 – January 14 | 8 Very intense tropical cyclone | 220 220 km/h (140 mph) | 910 | None | None | None | |
| 09 | N/A | January 15 | 2 Tropical Disturbance | 45 45 km/h (30 mph) | 1005 | Reunion, Mauritius, Madagascar | |||
| 10/11S | N/A | January 26 – January 30 | 3 Subtropical depression | 65 65 km/h (40 mph) | 1005 | Reunion, Mauritius, Madagascar | |||
| 11/13S | 6 Fami | February 1 – February 3 | 4 Moderate tropical storm | 85 85 km/h (50 mph) | 994 | Madagascar | |||
| 12/16S | 7 Gelane | February 15 – February 22 | 7 Intense tropical cyclone | 205 205 km/h (125 mph) | 930 | Reunion, Mauritius, Madagascar | |||
| 13/18S | 8 Hubert | March 7 – March 15 | 4 Moderate tropical storm | 100 100 km/h (65 mph) | 985 | Madagascar | |||
| 14/21S | 9 Imani | March 20 – March 27 | 6 Tropical cyclone | 130 130 km/h (80 mph) | 965 | None | None | None | |
| 15/23S | 10 Robyn | April 7 | 3 Dépression se comblant | 5555 km/h (35 mph) | 998 | None | None | None | |
| 16 | 11 Joel | May 26 – May 29 | 3 Subtropical depression | 100 100 km/h (65 mph) | 990 | Madagascar | |||
| 16 Systems | August 18 – May 29 | 220 km/h (140 mph) | 910 | None | None | ||||
See also
- List of Southern Hemisphere cyclone seasons
- Atlantic hurricane seasons: 20092009 Atlantic hurricane seasonThe 2009 Atlantic hurricane season was a below-average year, unlike the 2009 Pacific hurricane season, which was above average, both due to a moderate El Niño. During this year, nine tropical storms formed, the fewest since the 1997 season.An average season has ten tropical storms, six hurricanes...
, 20102010 Atlantic hurricane seasonThe 2010 Atlantic hurricane season was the third most active Atlantic hurricane season on record, tying with the 1887 Atlantic hurricane season, 1995 Atlantic hurricane season and the 2011 Atlantic hurricane season. It had the most number of named storms since the 2005 season and also ties with the... - Pacific hurricane seasons: 20092009 Pacific hurricane seasonThe 2009 Pacific hurricane season was an active event in the annual cycle of tropical cyclone formation, due to a moderate El Niño, unlike the 2009 Atlantic hurricane season, which was relatively quiet. The season officially started on May 15 in the eastern Pacific, and on June 1 for the central...
, 20102010 Pacific hurricane seasonThe 2010 Pacific hurricane season was the least active Pacific hurricane season, in terms of the number of named storms and hurricanes, on record, due to a moderate La Niña, unlike the 2010 Atlantic hurricane season, which was one of the most active on record... - Pacific typhoon seasons: 20092009 Pacific typhoon seasonThe 2009 Pacific typhoon season was the period that tropical cyclones formed in the Western Pacific Ocean. The season ran throughout the year during 2009, with most tropical cyclones forming between May and November. The scope of this article is limited to the Pacific Ocean, north of the equator...
, 20102010 Pacific typhoon seasonThe 2010 Pacific typhoon season was the least active Pacific typhoon season, in terms of the number of named storms and typhoons, on record, due to a moderate La Niña event... - North Indian Ocean cyclone seasons: 20092009 North Indian Ocean cyclone seasonThe 2009 North Indian Ocean cyclone season was an event in the annual cycle of tropical cyclone formation. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with peaks in May and November...
, 20102010 North Indian Ocean cyclone seasonThe 2010 North Indian Ocean cyclone season was a very active event in the annual cycle of tropical cyclone formation with some 8 depressions and 6 named storms, nearly above the average of 4-6 storms in the region due to a moderate La Niña... - 2009-10 Australian region cyclone season
- 2009-10 South Pacific cyclone season