2017–18 South-West Indian Ocean cyclone season

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2017–18 South-West Indian Ocean cyclone season
2017-2018 South-West Indian Ocean cyclone season summary.png
Season summary map
Seasonal boundaries
First system formed December 27, 2017
Last system dissipated Season Ongoing
Strongest storm
Name Berguitta
 • Maximum winds 165 km/h (105 mph)
(10-minute sustained)
 • Lowest pressure 940 hPa (mbar)
Seasonal statistics
Total disturbances 4 official, 1 unofficial
Total depressions 4
Total storms 3
Tropical cyclones 3
Intense tropical cyclones 1
Total fatalities > 51 total
Total damage $12 million (2018 USD)
Related articles
South-West Indian Ocean tropical cyclone seasons
2015–16, 2016–17, 2017–18, 2018–19, 2019–20

The 2017–18 South-West Indian Ocean cyclone season is a current event in the annual cycle of tropical cyclone and subtropical cyclone formation. It officially began on November 15, 2017, and will end officially on April 30, 2018, with the exception for Mauritius and the Seychelles, for which it will end on May 15, 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

Tropical cyclone scales#Comparisons across basins


Tropical Cyclone Ava

Tropical cyclone (MFR)
Category 2 tropical cyclone (SSHWS)
Ava 2018-01-05 1021Z.jpg Ava 2018 track.png
Duration December 27 – January 9
Peak intensity 155 km/h (100 mph) (10-min)  965 hPa (mbar)

Tropical Cyclone Irving

Tropical cyclone (MFR)
Category 2 tropical cyclone (SSHWS)
Irving 2018-01-08 0518Z.jpg Irving 2018 track.png
Duration January 6 (Entered basin) – January 9
Peak intensity 150 km/h (90 mph) (10-min)  964 hPa (mbar)

Intense Tropical Cyclone Berguitta

Intense tropical cyclone (MFR)
Category 3 tropical cyclone (SSHWS)
Berguitta 2018-01-15 0950Z.jpg Berguitta 2018 track.png
Duration January 12 – January 20
Peak intensity 165 km/h (105 mph) (10-min)  940 hPa (mbar)

Tropical Depression 04

Tropical depression (MFR)
04R 2018-01-15 1130Z.jpg 04R 2018 track.png
Duration January 15 – January 16
Peak intensity 55 km/h (35 mph) (10-min)  999 hPa (mbar)

Other systems

A low-pressure system, classified as a tropical low by the Australian Bureau of Meteorology,[1] moved west-southwest across the 90th meridian east into the Southwest Indian Ocean basin on August 8.[2] At 10:00 UTC the following day, Météo-France Réunion upgraded the low-pressure system to a zone of disturbed weather, with sustained winds of up to 55 km/h (35 mph) being detected on the southern side of the circulation by scatterometer.[3] At this time, the disturbance was located approximately 2,375 km (1,475 mi) west of Jakarta, Indonesia.[3] Météo-France noted that the revival of convective activity in the basin was likely due to the interaction between an eastwards-moving Kelvin wave and a westwards-moving Rossby wave.[3]

Storm names

Within the South-West Indian Ocean, tropical depressions and subtropical depressions that are judged to have 10-minute sustained wind speeds 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 2020–21 season. The unused names are expected to be reused in the list for the 2020–21 season.[4]

  • Ava
  • Berguitta
  • Cebile (unused)
  • Dumazile (unused)
  • Eliakim (unused)
  • Fakir (unused)
  • Guambe (unused)
  • Habana (unused)
  • Iman (unused)
  • Jobo (unused)
  • Kanga (unused)
  • Ludzi (unused)
  • Melina (unused)
  • Nathan (unused)
  • Onias (unused)
  • Pelagie (unused)
  • Quamar (unused)
  • Rita (unused)
  • Solani (unused)
  • Tarik (unused)
  • Urilia (unused)
  • Vuyane (unused)
  • Wagner (unused)
  • Xusa (unused)
  • Yarona (unused)
  • Zacarias (unused)

Season effects

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
Ava December 27 – January 9 Tropical cyclone 155 km/h (100 mph) 965 hPa (28.50 inHg) Madagascar Unknown 51 [5]
Irving January 6 – 9 Tropical cyclone 150 km/h (90 mph) 964 hPa (28.47 inHg) None None None
Berguitta January 12 – 20 Intense tropical cyclone 165 km/h (105 mph) 940 hPa (27.76 inHg) Mauritius, La Réunion $12 million > 1 [6][7]
04 January 15 – 16 Tropical depression 55 km/h (35 mph) 999 hPa (29.50 inHg) Mozambique None None
Season aggregates
4 systems December 27 – Present 165 km/h (105 mph) 940 hPa (27.76 inHg) 12 million > 51

See also


  1. ^ "WebCite query result". www.webcitation.org. Retrieved 2017-08-08. 
  2. ^ "WebCite query result". www.webcitation.org. Retrieved 2017-08-09. 
  3. ^ a b c "ZCIT Bulletin for August 9 2017" (PDF). 
  4. ^ 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. 
  5. ^ "Madagascar cyclone death toll rises to 51, with 54,000 people displaced". Hindustan Times. 15 January 2018. Retrieved 15 January 2018. 
  6. ^ "Tempête tropicale intense : quel impact et quel coût sur les secteurs affectés ?". Le Défi Média. 19 January 2018. Retrieved 19 January 2018. 
  7. ^ "Tropical Cyclone Berguitta PATH LIVE: Storm track LOOMS on La Reunion as Mauritius BLASTED". Express. 18 January 2018. Retrieved 19 January 2018. 

External links

  • Météo-France La Réunion (in French)
  • Joint Typhoon Warning Center (JTWC)
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