2018–19 South-West Indian Ocean cyclone season

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2018–19 South-West Indian Ocean cyclone season
2018-2019 South-West Indian Ocean cyclone season summary.png
Season summary map
Seasonal boundaries
First system formed September 13, 2018
Last system dissipated Currently active
Strongest storm
Name 01
 • Maximum winds 55 km/h (35 mph)
(10-minute sustained)
 • Lowest pressure 1004 hPa (mbar)
Seasonal statistics
Total disturbances 1
Total depressions 1
Total fatalities None
Total damage None
Related articles
South-West Indian Ocean tropical cyclone seasons
2016–17, 2017–18, 2018–19, 2019–20, 2020–21

The 2018–19 South-West Indian Ocean cyclone season is an ongoing event of the annual cycle of tropical cyclone and subtropical cyclone formation. It will officially begin on November 15, 2018, and will end on April 30, 2019, with the exception for Mauritius and the Seychelles, for which it will end on May 15, 2019. 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 Réunion.

Seasonal summary[edit]

Tropical cyclone scales#Comparisons across basins


Tropical Depression 01[edit]

Tropical depression (MFR)
Tropical storm (SSHWS)
01R 2018-09-16 0920Z.jpg 01R 2018 track.png
Duration September 13 – September 17
Peak intensity 55 km/h (35 mph) (10-min)  1004 hPa (mbar)

On September 13, a tropical depression formed to the southwest of Diego Garcia. The system tracked west-southwest, organizing slowly over marginally waters of 26-27 degrees Celsius and moderate wind shear. On September 16, the tropical depression began to weaken, after encountering unfavorable conditions. On September 18, the system dissipated.

Storm names[edit]

Within the South-West Indian Ocean, tropical depressions and subtropical depressions that are judged to have 10-minute sustained windspeeds of 65 km/h (40 mph) by the Regional Specialized Meteorological Center on La Réunion Island, France (RSMC La Réunion) are usually assigned a name. However, it is the Sub-Regional Tropical Cyclone Advisory Centers in Mauritius and Madagascar who name the systems. The Sub-Regional Tropical Cyclone Advisory Center in Mauritius names a storm should it intensify into a moderate tropical storm between 55°E and 90°E. If instead a cyclone intensifies into a moderate tropical storm between 30°E and 55°E then the Sub-Regional Tropical Cyclone Advisory Center in Madagascar assigns the appropriate name to the storm. Beginning from the 2016–17 season, name lists within the South-West Indian Ocean will be rotated on a triennial basis. Storm names are only used once, so any storm name used this year will be removed from rotation and replaced with a new name for the 2021–22 season. The unused names are expected to be reused in the list for the 2021–22 season.[1]

  • Alcide (unused)
  • Bouchra (unused)
  • Cilida (unused)
  • Desmond (unused)
  • Eketsang (unused)
  • Funani (unused)
  • Gelena (unused)
  • Haleh (unused)
  • Idai (unused)
  • Joaninha (unused)
  • Kenneth (unused)
  • Lorna (unused)
  • Maipelo (unused)
  • Njazi (unused)
  • Oscar (unused)
  • Pamela (unused)
  • Quentin (unused)
  • Rajab (unused)
  • Savana (unused)
  • Themba (unused)
  • Uyapo (unused)
  • Viviane (unused)
  • Walter (unused)
  • Xangy (unused)
  • Yemurai (unused)
  • Zanele (unused)

Seasonal effects[edit]

This table lists all of the tropical cyclones and subtropical cyclones that were monitored during the 2017–2018 South-West Indian Ocean cyclone season. Information on their intensity, duration, name, areas affected, primarily comes from RSMC La Réunion. Death and damage reports come from either press reports or the relevant national disaster management agency while the damage totals are given in 2017 or 2018 USD.

Name Dates active Peak classification Sustained
wind speeds
Pressure Areas affected Damage
Deaths Refs
01 September 13 – 17 Tropical depression 55 km/h (35 mph) 1004 hPa (29.65 inHg) None None None
Season aggregates
1 system September 13 – Present 55 km/h (35 mph) 1004 hPa (29.65 inHg) None None

See also[edit]


  1. ^ Regional Association I Tropical Cyclone Committee (2016). "Tropical Cyclone Operational Plan for the South-West Indian Ocean" (PDF). World Meteorological Organization. Retrieved 2016-10-05. 

External links[edit]