2017–18 South-West Indian Ocean cyclone season
cyclone season
The 2017–18 South-West Indian Ocean cyclone season was a below-average season that produced only 8 tropical storms, of which 6 became tropical cyclones. It was an event in the annual cycle of a tropical cyclone and subtropical cyclone formation. It officially began on 15 November 2017, and officially ended on 15 May 2018, in Mauritius and the Seychelles. For the rest of the basin, the season ended on 30 April 2018. 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 La Réunion.
Seasonal Summary
Despite the season officially beginning on 15 November 2017, the basin featured no tropical systems in November and December, owing to below-average sea surface temperatures and a period of enhanced trade winds causing conditions across the basin to be unfavorable for tropical cyclogenesis. This made the 2017–18 season the third in a row to not feature a tropical system before 1 January. The first system, Tropical Cyclone Ava, became a tropical disturbance only on 1 January 2018, placing 2017–18 in the five latest-starting seasons since the satellite era began in 1967. January, however, was very active with four named systems developing (including Irving, which entered the basin from the Australian region); Berguitta and Cebile in particular would become intense tropical cyclones on Météo-France La Réunion's scale.
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