https://arstechnica.com/science/2019/04/headlined-by-idai-south-indian-ocean-nears-end-of-record-hurricane-season/

In some respects, the hurricane season in the southern Indian Ocean was the busiest ever recorded. In terms of damage and major hurricanes, it seems to have been the worst in modern history. Hurricane scientists define the southern Indian Ocean basin as the part of the ocean south of the equator and west of 135° longitude, a region that extends from Africa to western Australia. The “cyclone” season in the southern Indian Ocean generally extends from about September to April, but for record keeping purposes it extends from 1 July of a given year to 30 June of the following year. The 2018-2019 season, which began on July 1, recorded 17 storms, according to statistics from University of Colorado hurricane researcher Phil Klotzbach and data from the Joint Typhoon Warning Center. Although this is not a record in itself, with the basin having experienced up to 22 storms dating back to 1980, this season’s storms were particularly severe.