The 1983–84 South-West Indian Ocean cyclone season featured above normal activity and several deadly storms.

Cyclone Andry passed near Agaléga island within Mauritius, damaging or destroying every building there and killing one person.

It later struck Madagascar, the first of three storms to strike the nation within two months, which collectively caused $25 million in damage[nb 1] and 42 deaths.

Less than two weeks after Domoina caused severe flooding in South Africa, Tropical Storm Imboa produced additional rainfall and high seas in the country, killing four people.

The final storm of the season was Cyclone Kamisy, which caused $250 million in damage and 69 deaths when it made landfalls in northern and northwestern Madagascar.

During the season, the Réunion Meteorological Service tracked storms in the basin, using the Dvorak technique to estimate tropical cyclone intensities via satellite imagery.

[1] The rest of the naming list was Lalao, Monja, Nora, Olidera, Pelazy, Rija, Saholy, Tsira, Vaosolo, Wilfredy, Yannika, and Zozo.

[12] On December 5, an area of convection persisted between Agaléga and Diego Garcia, which corresponded to a satellite-derived Dvorak rating of T2.0;[1] on this basis, MFR assessed the system as a tropical disturbance, and later that day, JTWC also initiated advisories.

On December 7, the storm intensified into a tropical cyclone,[1] the same day that the JTWC upgraded Andry to the equivalent of a minimal hurricane.

[13] After having moved to the west, the cyclone turned more to the west-southwest, and while doing so it passed just south of the Agaléga islands, producing wind gusts of 174 km/h (108 mph).

[13] Around that time, Andry was passing just north of the northernmost tip of Madagascar at Diego-Suarez, where the storm produced wind gusts of 250 km/h (155 mph).

[1] The cyclone weakened while curving to the southwest and later to the south,[13] making landfall on western Madagascar near Majunga with wind gusts of 198 km/h (123 mph).

Later that day, the system intensified to moderate tropical storm status, prompting the Mauritius Meteorological Service to name it Bakoly.

[nb 5][17] Passing within 100 km (60 mi) of Réunion, Bakoly produced 100 km/h (60 mph) winds and dropped 300 mm (12 in) of rainfall.

The next day, the agency estimated the system intensified into a moderate tropical storm,[18] prompting the Madagascar Meteorological Service to name it Caboto.

[18] Caboto made landfall on January 7 to the north of the mouth of the Mangoky River, and crossed the southern portion of the country, emerging near Farafangana into the Indian Ocean.

A developing ridge caused Caboto to slow after it reached open waters, executing a partial loop southwest of Réunion before turning to the south and dissipating on January 10.

Given the name Edoara by the Mauritius Meteorological Service, it quickly intensified into a moderate tropical storm, although it never strengthened beyond winds of 65 km/h (40 mph).

On Rodrigues, the storm produced wind gusts of 131 km/h (81 mph), and heavy rainfall reaching 253 mm (10.0 in) at Baie aux Huîtres.

[31] The next day, Galy made landfall near Mananjary, but soon after recurved to the southeast and emerged into the Indian Ocean near Fort Dauphin.

For about a week, the system remained weak and changed directions several times; after an eastward movement, it turned to the northwest, curved to the southeast, and later began a steady track to the southwest.

[1][32] On February 10, MFR began tracking a tropical disturbance in the Mozambique channel near Juan de Nova Island.

After executing a small loop, Imboa turned toward the southeastern African coastline and approached the eastern coasts of Mozambique and South Africa as a weakened system.

[1] While offshore South Africa, Imboa dropped heavy rainfall along the coast just weeks after Domoina flooded the region, reaching over 350 mm (14 in) in some locations.

Steered by a ridge to the south, it moved generally southwestward and intensified into Tropical Cyclone Annette, named by the Bureau of Meteorology.

After emerging into the Indian Ocean off the east coast of Madagascar, the system re-intensified into a moderate tropical storm before dissipating on April 16.

[1] In western Madagascar, the cyclone dropped 232.2 mm (9.14 in) of rainfall in 24 hours in Majunga, which damaged rice fields in the region after causing widespread river flooding.