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2022–23 South-West Indian Ocean cyclone season

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Tropical cyclone season
2022–23 South-West Indian Ocean cyclone season
Season summary map
Seasonal boundaries
First system formed23 September 2022
Last system dissipatedSeason ongoing
Strongest storm
NameDarian
 • Maximum winds220 km/h (140 mph)
(10-minute sustained)
 • Lowest pressure920 hPa (mbar)
Seasonal statistics
Total disturbances7
Total depressions7
Total storms6
Tropical cyclones4
Intense tropical cyclones2
Very intense tropical cyclones1
Total fatalities33
Total damageUnknown
Related articles
South-West Indian Ocean tropical cyclone seasons
2020–21, 2021–22, 2022–23, 2023–24, 2024–25

The 2022–23 South-West Indian Ocean cyclone season is an ongoing event of the annual cycle of tropical cyclone and subtropical cyclone formation. It began on 15 November 2022, and will end on 30 April 2023, with the exception for Mauritius and the Seychelles, for which it will end on 15 May 2023. These dates conventionally delimit the period of each year when most tropical and subtropical cyclones form in the basin, which is west of 90°E and south of the Equator. However, tropical cyclones can form year-round, and all tropical cyclones that will form between 1 July 2022 and 30 June 2023 will be part of the season. Tropical and subtropical cyclones in this basin are monitored by the Regional Specialised Meteorological Centre in Réunion and unofficially by the Joint Typhoon Warning Center.

Seasonal forecasts

Forecast
Center 		Systems
Mauritius Meteorological Services 11–9 tropical cyclones
Météo-France 6–10 tropical cyclones
Forecast
Center 		Chance of
above average
Météo-France 30% 60% 10%
Source: Seasonal Outlook for Tropical Cyclones.

In October 2022, Météo-France issued its seasonal forecast of cyclone activity for the basin. The MFR predicted a season that was slightly below average to average, citing the effects of a La Niña event. The MFR placed chances of a below-average season at 60%. Average cyclone activity was given a 30% chance, and an above-average level of activity was given a 10% chance. The season in the South-West Indian Ocean was expected to be above average, with 6-10 tropical cyclones or moderate tropical storm.

The Mauritius Meteorological Services (MMS) released their summer 2022–23 outlooks. An average season, with around eleven to nine cyclones forming, was expected. The MMS also indicates that the eastern part of the basin is more conducive to cyclone formation in the second half of summer, and the western part of the basin will also become favorable for storm formation during the second half.

Seasonal summary

Cyclone ChenesoTropical cyclone scales#Comparisons across basins

The season began early, with a weak tropical low being produced on 22 September. Improving conditions over the next three days allowed the development of the system, which strengthened into Moderate Tropical Storm Ashley on 27 September. The system slowly moved westward and weakened into a remnant low on 30 September. Pre-season activity continued, with a disturbance being produced as a result of a westerly wind burst. Another storm formed on 6 October, and was named Balita on 8 October. In November 2022, Tropical Low 02U (reclassified the system as Tropical Depression 03) entered the basin and degenerated into a remnant low by the next day. In December, Severe Tropical Cyclone Darian (classified as a very intense tropical cyclone) entered the basin, before gradually weakening. In January, a new disturbance became a tropical depression and was later named Cheneso. The cyclone strengthened to severe tropical storm status before making landfall over Madagascar on 19 January. It re-intensified to Tropical Cyclone Cheneso after moving southwestwards as a overland depression (according to MFR). It was last noted as a subtropical depression on 29 January. Tropical Low 11U from the Australian region moved into this basin, where it was classified as Moderate Tropical Storm Dingani. The JTWC classified it as Tropical Cyclone 13S. Although initially struggling to intensify due to wind shear, it gradually intensified and eventually reached Tropical Cyclone status by the MFR. The JTWC upgraded it to a Category 1 tropical cyclone.

Systems

Moderate Tropical Storm Ashley

Moderate tropical storm (MFR)
Tropical storm (SSHWS)
 
Duration23 September – 28 September
Peak intensity75 km/h (45 mph) (10-min);
1000 hPa (mbar)

On 22 September, a near-equatorial trough produced a weak tropical low in the Indian Ocean, initially expected by MFR to not form due to upper wind shear. Environmental conditions improved over the next 3 days, and the low organized enough to become the first tropical depression of the season by 26 September. Early the next day, the JTWC subsequently designated the storm as Tropical Cyclone 02S, citing a scatterometer pass indicating tropical storm-force winds in its western and eastern semicircles. The MFR also upgraded the system into a moderate tropical storm, and the Mauritius Meteorological Services (MMS) named it Ashley. The system then reached peak intensity, with 10-minute sustained winds of 75 km/h (45 mph), before succumbing to strong northeasterly shear and significant dry air intrusions late on the same day, prompting the JTWC to issue their final advisory on Ashley. The MFR terminated advisories by 06:00 UTC on 28 September as Ashley weakened into a remnant low, but continued to track the storm until it was last noted on 30 September as a dissipating low.

Moderate Tropical Storm Balita

Moderate tropical storm (MFR)
Tropical storm (SSHWS)
 
Duration3 October – 9 October
Peak intensity65 km/h (40 mph) (10-min);
996 hPa (mbar)

On 2 October, the MFR began to monitor a disturbance associated with the convergence of the westerly wind burst. However, convective activity was located in the low-level convergences. Later the next day, the JTWC began monitoring an area of convection. Satellite images indicated that the low-level cloud lines wrapping into the low-level center. Early on 5 October, the JTWC issued a Tropical Cyclone Formation Alert on the system. The JTWC subsequently initiated advisories on the system and classified it as Tropical Cyclone 03S at 03:00 UTC on 6 October. By 06:00 UTC, the MFR upgraded it to a tropical depression. An ASCAT pass featured below gale-force winds on its southern quadrant. Despite moderate northeasterly wind shear, convection increased around the system.

The MFR further upgraded it to a moderate tropical storm at 00:00 UTC on 8 October with the name Balita from the MMS. Microwave imagery revealed that Balita had improved its convective structure. At 06:00 UTC on October 9, Balita's structure became elongated and asymmetrical, prompting MFR to reclassify the storm as a post-tropical depression. Later that same day, the MFR ceased advisories, and the JTWC followed suit. The remnants fully dissipated on 13 October.

Tropical Depression 03

Tropical depression (MFR)
 
Duration5 November (Entered basin) – 6 November
Peak intensity55 km/h (35 mph) (10-min);
1008 hPa (mbar)

On 5 November, Tropical Low 02U that was being monitored by the MFR crossed into the South-West Indian Ocean basin from the Australian region. At the time, there was no more convection associated, only a low-level vortex. Thunderstorm activity has resumed in the southern part of the system in the last few hours. Upon entering the basin, the JTWC ceased advisories by 09:00 UTC that day. The MFR's reclassified the system as Tropical Depression 03. Environmental conditions were assessed as being marginally conducive for tropical cyclogenesis, with low vertical wind shear and moderate equatorial outflow. At 06:00 UTC on 6 November, the MFR's issued their last warning as the system degenerated into a remnant low.

Very Intense Tropical Cyclone Darian

Very intense tropical cyclone (MFR)
Category 4 tropical cyclone (SSHWS)
 
Duration21 December (Entered basin) – 30 December
Peak intensity220 km/h (140 mph) (10-min);
920 hPa (mbar)

On 21 December, Severe Tropical Cyclone Darian moved into the basin from the Australian region, and was immediately classified as a very intense tropical cyclone by MFR. Darian exhibited a highly symmetrical cloud structure around a well-defined eye. Shortly afterward, Darian's cloud pattern deteriorated and its eye started to become less defined, causing the cyclone to weaken to an intense tropical cyclone by 18:00 UTC. Darian weakened to a Category 3-equivalent cyclone the next day, as the convective cloud tops had warmed slightly. Darian's then weakened due to strong wind shear, and was downgraded into a tropical cyclone. With a well-defined eye and impressive appearance on satellite imagery, Darian re-intensified, reaching 10-minute maximum sustained winds of 165 km/h (105 mph) around 06:00 UTC on 23 December. The cyclone was highly compact, with a distinct eye surrounded by cold cloud tops. Around the same time, the JTWC's also assessed Darian as having 1-minute maximum sustained winds of 240 km/h (150 mph), making the storm a Category 4-equivalent cyclone again on the Saffir–Simpson scale (SSHWS). Darian became quasi-stationary due to the presence of two main flows. The cyclone's eye can be seen from satellite imagery, and its cloud tops warmed to −99 to −108 °F (−73 to −78 °C). Steady weakening occurred thereafter as it underwent an eyewall replacement cycle.

Multispectral animated satellite imagery revealed a 8 nautical miles (15 km; 9.2 mi) surrounded eye around deep convection as a result, the cyclone weakened to Category 2-equivalent cyclone. Further weakening occurred as the MFR assessed that Darian's winds bottomed out at 155 km/h (100 mph). At 03:00 UTC on 26 December, the JTWC reported that Darian had re-strengthened to 205 km/h (125 mph) with a warm 14 °F (−10 °C), a wide eye 25 nautical miles (46 km; 29 mi), and was surrounded by cold, −98 to −116 °F (−72 to −82 °C) cloud tops. Using the Dvorak technique, MFR estimated winds of 185 km/h (115 mph). Due to moderate east-northeasterly vertical wind shear, Darian fell to 155 km/h (100 mph) winds, according to MFR. Just six hours later, the eye feature persisted, consisting of a warm area within the cooling eyewall. At 15:00 UTC on 27 December, the JTWC further downgraded it to a Category 1-equivalent cyclone. Satellite imagery showed that the cloud pattern began to rapidly deteriorate, and MFR followed suit and declared it a severe tropical storm. The JTWC also reported that Darian's weakened into a tropical storm. By 00:00 UTC on 29 December, Darian weakened into a moderate tropical storm, after the convection diminished around the center. MFR issued its last advisory on the storm on 30 December as it transitioned into a post-tropical depression. The JTWC also discontinued warnings on the system around 03:00 UTC on 31 December.

Tropical Cyclone Cheneso

Tropical cyclone (MFR)
Category 2 tropical cyclone (SSHWS)
 
Duration16 January – 29 January
Peak intensity130 km/h (80 mph) (10-min);
959 hPa (mbar)
Main article: Cyclone Cheneso

The percursor to Cheneso formed on 16 January to the south of Diego Garcia. The system meandered southwestward, becoming a tropical disturbance on 18 January. By late the next day, the system had intensified into Moderate Tropical Storm Cheneso, and the JTWC classified it as Tropical Cyclone 08S. Satellite imagery showed that a central dense overcast (CDO) was obscuring the low-level circulation center (LLCC), and Cheneso intensified further into a severe tropical storm. The cyclone moved ashore in northeastern Madagascar on 17 January and quickly weakened as it crossed the country. It emerged into the Mozambique Channel as a weak tropical disturbance. The storm again reached open waters, and briefly re-intensified into a tropical cyclone. By 06:00 UTC on 29 January, Cheneso's structure became poorly organized, prompting MFR to reclassify the storm as a post-tropical depression.

The National Bureau of Risk and Disaster Management (BNGRC) reported 90,870 affected people, and 34,100 were displaced. At least 33 people were killed on the onslaught of Cheneso and 20 others missing.

Tropical Cyclone Dingani

Tropical cyclone (MFR)
Category 2 tropical cyclone (SSHWS)
 
Duration9 February (Entered basin) – 15 February
Peak intensity140 km/h (85 mph) (10-min);
971 hPa (mbar)

On 9 February, Tropical Low 11U from the Australian region entered the basin and was designated as Moderate Tropical Storm Dingani. By 03:00 UTC, the JTWC issued a TCFA, after noting persistent deep convection within its southern quadrant. Later that day, the JTWC initiated advisories on the system and classified it as Tropical Cyclone 13S. The storm had a broad and fully exposed LCC, but was struggling due to northeasterly vertical windshear. By 00:00 UTC on 11 February, as convection maintained near the center, the MFR upgraded the system to a severe tropical storm. Later the next day, Dingani had rapidly consolidated as it formed a 20 km (12 mi) diameter eye, including a significant improved convective structure; the JTWC's assessed the storm to have strengthened into 140 km/h (85 mph) of winds. Dingani continued to intensify and soon became a tropical cyclone. Twelve hours later, the cyclone maintained a well defined-eye. However, shear began impacting the storm, causing the eye to dissappear. By 00:00 UTC on 14 February, Dingani weakened back into a severe tropical storm. The JTWC also reported that Dingani's weakened into a tropical storm. Later the next day, Dingani later transitioned into a post-tropical depression.

Intense Tropical Cyclone Freddy

Intense Tropical Cyclone Freddy
Current storm status
Intense tropical cyclone (MFR)
Current storm status
Category 4 tropical cyclone (1-min mean)
Satellite image Forecast map
As of:18:00 UTC, 15 February
Location:15°06′S 79°06′E / 15.1°S 79.1°E / -15.1; 79.1 (Intense Tropical Cyclone Freddy) ± 20 nm
About 2,445 km (1,519 mi) E of Réunion
About 3,560 km (2,210 mi) E of Mayotte
Sustained winds:105 knots (195 km/h; 120 mph) (10-min mean)
gusting to 160 knots (295 km/h; 185 mph)
120 knots (220 km/h; 140 mph) (1-min mean)
Pressure:940 hPa (27.76 inHg)
Movement:W at 15 kn (28 km/h; 17 mph)
See more detailed information.

On 14 February, Severe Tropical Cyclone Freddy moved into the basin from the Australian region and was classified as a tropical cyclone. The agency later upgraded the system to a intense tropical cyclone. Freddy's structure began to improve as a eye feature was becoming visible in a small central dense overcast, Freddy then began to exhibit some annular characteristics, before re-intensifying and reaching 1-minute maximum sustained winds of 220 km/h (140 mph) around 03:00 UTC on 15 February. The JTWC noted that Freddy had a small symmetric 8 km (5.0 mi) eye.

Current storm information

As of 12:00 UTC 16 February, Intense Tropical Cyclone Freddy is located within 20 nautical miles of 14°54′S 79°36′E / 14.9°S 79.6°E / -14.9; 79.6 (Freddy) or about 2,600 km (1,600 mi) east of Réunion and about 3,720 km (2,310 mi) east of Mayotte. Maximum 10-minute sustained winds are at 120 knots (220 km/h; 140 mph), with gusts up to 160 knots (295 km/h; 185 mph) while maximum 1-minute sustained winds are at 135 knots (250 km/h; 155 mph). The minimum central barometric pressure is 940 hPa (27.76 inHg), and the system is moving west at 14 kn (26 km/h; 16 mph).

For the latest official information, see:

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 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 (Mauritius Meteorological Services) in Mauritius names a storm if it intensifies into a moderate tropical storm between 55°E and 90°E. If instead a cyclone intensifies into a moderate tropical storm between 30°E and 55°E then the Sub-Regional Tropical Cyclone Advisory Center (Meteo Madagascar) in Madagascar assigns the appropriate name to the storm. Storm names are taken from three pre-determined lists of names, which rotate on a triennial basis, with any names that have been used automatically removed. Therefore, all storm names used this year will be removed from the rotation and replaced with a new name for the 2025–26 season, while the unused names will remain on the list. New names this season are: Ashley, Balita, Cheneso, Dingani, Enali, Fabien, Gezani, Horacio, Indusa and Juluka. They replaced Ambali, Belna, Calvinia, Diane, Esami, Francisco, Gabekile, Herold, Irondro and Jeruto during the 2019–20 season.

  • Ashley
  • Balita
  • Cheneso
  • Dingani
  • Enala (unused)
  • Fabien (unused)
  • Gezani (unused)
  • Horacio (unused)
  • Indusa (unused)
  • Juluka (unused)
  • Kundai (unused)
  • Lisebo (unused)
  • Michel (unused)
  • Nousra (unused)
  • Olivier (unused)
  • Pokera (unused)
  • Quincy (unused)
  • Rebaone (unused)
  • Salama (unused)
  • Tristan (unused)
  • Ursula (unused)
  • Violet (unused)
  • Wilson (unused)
  • Xila (unused)
  • Yekela (unused)
  • Zania (unused)

If a tropical cyclone enters the South-West Indian basin from the Australian region basin (west of 90°E), it will retain the name assigned to it by the Australian Bureau of Meteorology (BoM). The following storms were named in this manner.

  • Darian
  • Freddy (active)

Season effects

This table lists all of the tropical cyclones and subtropical cyclones that were monitored during the 2022–2023 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 2022 or 2023 USD.

Name Dates Peak intensity Areas affected Damage
(USD) 		Deaths Refs
Category Wind speed Pressure
Ashley 23 – 28 September Moderate tropical storm 75 km/h (45 mph) 1000 hPa (29.53 inHg) None None None
Balita 3 – 9 October Moderate tropical storm 65 km/h (40 mph) 996 hPa (29.41 inHg) None None None
03 5 – 6 November Tropical depression 55 km/h (35 mph) 1008 hPa (29.77 inHg) None None None
Darian 21 – 30 December Very intense tropical cyclone 220 km/h (140 mph) 920 hPa (27.17 inHg) None None None
Cheneso 16 – 29 January Tropical cyclone 150 km/h (90 mph) 959 hPa (28.32 inHg) Madagascar Unknown 33
Dingani 9 – 15 February Tropical cyclone 140 km/h (85 mph) 971 hPa (28.67 inHg) None None None
Freddy 14 February – Present Intense tropical cyclone 215 km/h (130 mph) 937 hPa (27.67 inHg) None None None
Season aggregates
7 systems 23 September 2022 – Season ongoing 220 km/h (140 mph) 920 hPa (27.17 inHg) Unknown 33

See also

References

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External links

Tropical cyclones of the 2022–23 South-West Indian Ocean cyclone season
MTSAshley MTSBalita TD03 VITCDarian TCCheneso TCDingani VITCFreddy (history) TCEnala MTS09 ITCFabien
2020–2029 South-West Indian Ocean cyclone seasons
Tropical cyclones in 2022 and 2023
Cyclones
Hurricanes
Typhoons
Non-seasonal lists
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