1999–2000 South-West Indian Ocean cyclone season
The 1999–2000 South-West Indian Ocean tropical cyclone season was the first on record in which two storms – Leon–Eline and Hudah – struck Mozambique at tropical cyclone intensity, or with maximum sustained winds of at least 120 km/h (75 mph). The most notable storm of the season was Eline, which was the longest-lasting storm on record in the basin. It lasted for 29 days while traversing the southern Indian Ocean, making the strongest landfall in decades along eastern Madagascar in late February. The storm was the first in a series of three storms that struck the country in early 2000, along with Gloria in March and Hudah in April. Collectively, the three storms killed at least 316 people. The season started on November 1, 1999, and ended for most of the basin on April 30, 2000; for Mauritius and the Seychelles, the season continued until May 15. These dates conventionally delimit the period of each year when most tropical cyclones form in the basin;
1989–90 South-West Indian Ocean cyclone season
Operationally, the MFR considered the tropical cyclone year to begin on August 1 and continue to July 31 of the following year. However, the JTWC began the year on July 1 and it lasted through June 30 of the following year. The latter agency tracked two short-lived tropical cyclones in July 1989, labeling them Tropical Cyclone 01S and 02S, but they are not considered part of MFR's season. After these early storms, another tropical depression formed east of Diego Garcia on September 21, classified as Tropical Cyclone 03S. Forming from the near-equatorial trough, the system moved generally to the southwest, dissipating on September 27 as it approached Mauritius. In the next month, Tropical Cyclone 04S formed closer to Diego Garcia on October 11. The JTWC classified it as a tropical depression on October 13 but dropped advisories the next day. The system initially drifted to the south but later turned to the northwest, dissipating on October 17. The final of a series of early tropical systems was a tropical depression that formed east of Diego Garcia on October 28. It moved southeastward, classified by the JTWC as Tropical Cyclone 05S on October 31. The agency briefly estimated peak winds of , making it a tropical storm, before the storm looped back to the west and dissipated on November 2. Later, the precursor to Australian Tropical Cyclone Bessi was tracked in the eastern portion of the south-west Indian Ocean basin in the middle of April. The Australian Bureau of Meteorology (BOM) classified the system as a minimal tropical storm while still west of 90° E, although the MFR did not classify the system before it entered the Australian basin on April 15.