The 2024–25 South-West Indian Ocean cyclone season is the current annual cycle of tropical cyclone and subtropical cyclone formation. It begins on 15 November 2024, and will end on 30 April 2025, with the exception for Mauritius and the Seychelles, for which it will end on 15 May 2025. 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 with any cyclone forming between 1 July 2024 and 30 June 2025, like 01 in August, 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.
| 2024–25 South-West Indian Ocean cyclone season | |
|---|---|
 Season summary map | |
| Seasonal boundaries | |
| First system formed | 15 August 2024 |
| Last system dissipated | Season ongoing |
| Strongest storm | |
| Name | 01 |
| • Maximum winds | 55 km/h (35 mph) (10-minute sustained) |
| • Lowest pressure | 1000 hPa (mbar) |
| Seasonal statistics | |
| Total disturbances | 1 |
| Total depressions | 0 |
| Total storms | 0 |
| Tropical cyclones | 0 |
| Intense tropical cyclones | 0 |
| Very intense tropical cyclones | 0 |
| Total fatalities | 0 |
| Total damage | $0,000 (2025 USD) |
| Related articles | |
Seasonal summary
editSystems
editTropical Disturbance 01
edit| Tropical disturbance (MFR) | |
| Duration | 15 August – 17 August |
|---|---|
| Peak intensity | 55 km/h (35 mph) (10-min); 1000 hPa (mbar) |
On August 8, the MFR noted that in mid-August, tropical cyclogenesis was possible near the equator due to a westerly wind burst expected to form during the active phase of the Madden–Julian oscillation (MJO).[1] Three days later, a near-equatorial trough formed, with convective activity developing near the trough's axis.[2] Slowly developing, on August 13, a low-level circulation was seen, with convective bands wrapping around its circulation.[3] Two days later, the Joint Typhoon Warning Center (JTWC) began tracking the disturbance, noting that it was in a marginal environment for development.[4] Just a few hours later, the MFR designated the disturbance as Zone of Disturbed Weather 01.[5] Soon after, the JTWC issued a Tropical Cyclone Formation Alert (TCFA) on the disturbance, noting that despite being in an environment with high wind shear, it was intensifying.[6] Early the next day, the MFR designated it as a tropical disturbance, stating that it had a small window to intensify.[7] However, it weakened into a zone of disturbed weather, and after its window of development ended on August 17, the MFR issued their last warning on the system.[8] The JTWC soon cancelled their TCFA on the disturbance, noting that it could still develop.[9] Despite that, early the next day, the MFR began re-monitoring the disturbance as it was developing despite being in an unfavorable environment.[10]
Storm names
editWithin 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. New names this season are: Ancha, Bheki, Chido, Dikeledi, Elvis, Faida, Garance, Honde, Ivone, Jude, Kanto and Lira. They replaced Ana, Batsirai, Cliff, Dumako, Emnati, Fezile, Gombe, Halima, Issa, Jasmine and Karim during the 2021–22 season, and also Letlama, which was not used, but the reason for its removal is unknown.[11]
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Season effects
editThis table lists all of the tropical cyclones and subtropical cyclones that were monitored during the 2024–2025 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 2024 or 2025 USD.
| Name | Dates | Peak intensity | Areas affected | Damage (USD) |
Deaths | Refs | ||
|---|---|---|---|---|---|---|---|---|
| Category | Wind speed | Pressure | ||||||
| 01 | 15 – 17 August | Tropical disturbance | 55 km/h (35 mph) | 1000 hPa (29.53 inHg) | Chagos Archipelago | None | 0 | |
| Season aggregates | ||||||||
| 1 system | August 15 – Season ongoing | 55 km/h (35 mph) | 1,000 hPa (30 inHg) | None | None | |||
See also
edit- Weather of 2024 and 2025
- List of Southern Hemisphere cyclone seasons
- Tropical cyclones in 2024 and 2025
- Atlantic hurricane seasons: 2024, 2025
- Pacific hurricane seasons: 2024, 2025
- Pacific typhoon seasons: 2024, 2025
- North Indian Ocean cyclone seasons: 2024, 2025
- 2024–25 Australian region cyclone season
- 2024–25 South Pacific cyclone season
References
edit- ^ Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean (PDF) (Report). Météo-France. 8 August 2024. Retrieved 8 August 2024.
- ^ Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean (PDF) (Report). Météo-France. 11 August 2024. Retrieved 11 August 2024.
- ^ Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean (PDF) (Report). Météo-France. 14 August 2024. Retrieved 14 August 2024.
- ^ Significant Tropical Weather Advisory for the Indian Ocean, 01Z 15 August 2024 Reissued (Report). United States Joint Typhoon Warning Center. 15 August 2024. Archived from the original on 2024-08-15. Retrieved 15 August 2024.
- ^ Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean (PDF) (Report). Météo-France. 15 August 2024. Retrieved 15 August 2024.
- ^ Tropical Cyclone Formation Alert (Invest 90S) (Report). United States Joint Typhoon Warning Center. 15 August 2024. Archived from the original on 2024-08-15. Retrieved 15 August 2024.
- ^ Tropical Disturbance 01 Warning Number (2/1/20242025) (PDF) (Report). Météo-France. 16 August 2024. Retrieved 16 August 2024.
{{cite report}}: CS1 maint: url-status (link) - ^ Zone of Disturbed Weather 01 Warning Number (6/1/20242025) (PDF) (Report). Météo-France. 17 August 2024. Retrieved 17 August 2024.
{{cite report}}: CS1 maint: url-status (link) - ^ Tropical Cyclone Formation Alert (Invest 90S) Cancellation (Report). United States Joint Typhoon Warning Center. 17 August 2024. Archived from the original on 2024-08-17. Retrieved 17 August 2024.
- ^ Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean (PDF) (Report). Météo-France. 18 August 2024. Retrieved 18 August 2024.
- ^ RA I Tropical Cyclone Committee (2023). Tropical Cyclone Operational Plan for the South-West Indian Ocean (PDF) (Report). World Meteorological Organization. Archived from the original (PDF) on 2024-07-02.