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.

Tropical and subtropical cyclones in this basin are monitored by the Regional Specialised Meteorological Centre in Réunion.

[9] During that day despite having a low-level circulation centre that was located to the east of the deepest atmospheric convection, the system developed into a tropical depression.

[citation needed] During December 30, Severe Tropical Cyclone Kate moved into the basin from the Australian region, where it was immediately classified as an intense tropical cyclone with 10-minute sustained wind speeds of 175 km/h (110 mph) by RSMC La Réunion.

In the next day, the MFR upgraded Bansi to a tropical cyclone, as the system formed a ragged eye.

However, it soon weakened to a Category 2 on the SSHWS (intense tropical cyclone for MFR) due to an eyewall replacement cycle.

[citation needed] On January 11, the JTWC started to monitor a weak tropical disturbance inland over Mozambique.

[citation needed] The formative stages of Chedza brought rainfall to an already flooded region across southeastern Africa.

[20] Weeks of heavy rainfall killed 117 people in Mozambique and 104 in neighboring Malawi, where it was the worst flood in 24 years.

[21][22][23] In Madagascar, Chedza struck after weeks of heavy rainfall,[24] causing rivers to increase and flooding widespread areas of crop fields.

Later that day, the area of disturbed weather intensified into a depression, as the MFR and JTWC issued their initial advisories, and designated it as 08S.

[citation needed] On January 27, RSMC La Réunion reported that Tropical Disturbance 08, had developed to the northeast of Mauritius.

The next day, Eunice weakened to an intense tropical cyclone as it underwent an eyewall replacement cycle.

[citation needed] Similar to the formation of Chedza, a weak tropical disturbance developed near shore over southern Mozambique on February 4.

On February 5, the MFR upgraded a low-pressure system east of Mozambique to a zone of disturbed weather.

[citation needed] While in its formative stages, the storm brought rainfall to southwestern Madagascar, totaling 109 mm (4.3 in) in Tulear.

[31] The effects of Fundi in Madagascar worsened the situation in areas still recovering from Severe Tropical Storm Chedza the previous month.

[32] On February 22, a tropical low formed on open seas of the Indian Ocean east of Diego Garcia.

[citation needed] The disturbance continued to move in a westerly direction as the JTWC issued a Tropical Cyclone Formation Alert on the system.

[34] On March 5, the JTWC started issuing advisories on a tropical system over the Mozambique Channel and was designated as 15S.

[citation needed] During the early stages of Haliba's development it produced heavy rains across eastern Madagascar, resulting in severe flooding.

[39] On April 1, the MFR began to monitor Tropical Disturbance 13 several miles southeast of Diego Garcia.

Joalane rapidly intensified into a Tropical Cyclone strength system and reached peak intensity.

Due to a favorable environment, the system strengthened quickly, with MFR upgrading it to a tropical cyclone and was named Ikola as it crossed into the Australian region the next day.

[41][42] However, during that day the system's low-level circulation centre became exposed and displaced about 280 km (175 mi) from the deep convection.

[42][43][44] 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.

Information on their intensity, duration, name, areas affected, primarily comes from RSMC La Réunion.