The 1985–86 South-West Indian Ocean cyclone season was the first in which the Météo-France office (MFR) on Réunion tracked cyclones as far east as 90° E in Indian Ocean, south of the equator. Previously, the agency's area of responsibility was limited to 80° E. It was an active season with twelve named storms, of which five strengthened into tropical cyclone with 10 minute sustained winds of at least 120 km/h (75 mph). The first named storm was Tropical Storm Alifredy, which originated in the Mozambique Channel in late December and moved across Madagascar. However, the unofficial Joint Typhoon Warning Center (JTWC) tracked a short-lived storm in September.

Tromelin Island, once called the Isle of Sand, is a low, flat island in the Indian Ocean about 500 km north of Réunion and about 450 km east of Madagascar. Tromelin is part of the Scattered Islands in the Indian Ocean, the fifth district of the French Southern and Antarctic Lands, a French Overseas Territory, but Mauritius claims sovereignty over the island.