1979–80 South-West Indian Ocean cyclone season

	Intense tropical cyclone (MFR)
	Category 3 tropical cyclone (SSHWS)
Duration	November 25 – December 6
Peak intensity	195 km/h (120 mph) (10-min)

	Category 2 tropical cyclone (Australian scale)
	Tropical storm (SSHWS)
Duration	August 27 – August 31
Peak intensity	95 km/h (60 mph) (10-min) 990 hPa (mbar)

1979–80 South-West Indian Ocean cyclone season
	Season summary map
Seasonal boundaries
First system formed	August 30, 1979
Last system dissipated	March 20, 1980
Strongest storm
Name	Viola-Claudette
• Maximum winds	205 km/h (125 mph); (10-minute sustained)
• Lowest pressure	930 hPa (mbar)
Seasonal statistics
Total depressions	11
Total storms	11
Tropical cyclones	4
Intense tropical cyclones	2
Total fatalities	Unknown
Total damage	Unknown
Related articles
	1979–80 Australian region cyclone season; 1979–80 South Pacific cyclone season;

The 1979–80 South-West Indian Ocean cyclone season was an above average cyclone season. The season officially ran from November 1, 1979, to April 30, 1980.

Systems

Tropical Cyclone Tony

On 26 August, TCWC Perth reported that a tropical low had developed on a shear line about 1300 km (810 mi) to the northwest of Cocos Island.^[1] Over the next couple of days the depression gradually developed further before at 1800 UTC on 27 August, TCWC Perth estimated that it had become a tropical cyclone and named it Tony.^[1] During the next couple of days, the system moved towards the west-southwest before on 29 August it reached its peak intensity of 95 km/h (60 mph) and a peak pressure of 990 hPa (29.23 inHg) as it approached the edge of TCWC Perth's area of responsibility.^[1] During the next day, Tony moved into the South West Indian Ocean and weakened gradually before it dissipated during 31 August.^[1] Neither the Mauritius or Reunion meteorological services monitored Tony as a tropical cyclone while it was active, while it was not included in the JTWC's analysis of the season.^[1]^[2]^[3]

Intense Tropical Cyclone Albine

Albine existed from 25 November to 6 December.

Intense Tropical Cyclone Viola-Claudette

Intense tropical cyclone (MFR)
Category 3 tropical cyclone (SSHWS)

Duration	December 10 – December 28
Peak intensity	205 km/h (125 mph) (10-min) 930 hPa (mbar)

Viola-Claudette existed from 10 December to 28 December.

Severe Tropical Storm Berenice

Severe tropical storm (MFR)
Tropical storm (SSHWS)

Duration	December 15 – December 21
Peak intensity	95 km/h (60 mph) (10-min)

Berenice existed from 15 December to 21 December.

Severe Tropical Cyclone Wilf-Danitza

Category 3 severe tropical cyclone (Australian scale)
Tropical storm (SSHWS)

Duration	December 23 – January 3
Peak intensity	130 km/h (80 mph) (10-min) 973 hPa (mbar)

Wilf-Danitza existed from 23 December, 1979, to 3 January, 1980.

Tropical Cyclone Hyacinthe

Tropical cyclone (MFR)
Category 1 tropical cyclone (SSHWS)

Duration	January 15 – January 31
Peak intensity	135 km/h (85 mph) (10-min) 955 hPa (mbar)

Hyacinthe formed on January 15, 1980, to the northeast of Mauritius in the southern Indian Ocean. Initially it moved to the west-southwest, and while slowly intensifying it passed north of the French overseas department of Réunion. On January 19, Météo-France estimated that the storm had intensified to a tropical cyclone. Hyacinthe looped to the south of eastern Madagascar and weakened, although it restrengthened after turning to the east. The storm executed another loop to the southwest of Réunion, passing near the island for a second and later third time. Hyacinthe became extratropical on January 29 after turning southward, dissipating two days later.

Tropical Cyclone Hyacinthe set several worldwide tropical cyclone rainfall records in Réunion in the Southwestern Indian Ocean, including a peak total of 5678 mm (223.5 inches).^[4] For twelve days, Hyacinthe dropped torrential rainfall on Réunion; nearly all of the island received more than 1 m (3.3 ft) of precipitation. Over a 15‑day period from January 14 to January 28, 6,083 mm (239.5 in) of rainfall were recorded at Commerson's Crater, a volcano. The heaviest rainfall occurred through a process called orographic lift in the mountainous interior, leading to hundreds of landslides. Widespread floods washed out roads and isolated three villages. Hyacinthe caused heavy damage to crops and damaged or destroyed 2,000 houses. Losses from the storm totaled $167 million (1980 USD, 676 million francs), and 25 people were killed.

Cyclone Jacinthe

Category 3 tropical cyclone (SSHWS)

Duration	February 1 – February 7
Peak intensity	185 km/h (115 mph) (1-min)

Jacinthe existed from 1 February to 7 February.

Cyclone Fred

Category 2 tropical cyclone (SSHWS)

Duration	February 20 – February 28
Peak intensity	175 km/h (110 mph) (1-min)

Fred existed from 20 February to 28 February.

Cyclone Kolia

Tropical storm (SSHWS)

Duration	February 25 – March 13
Peak intensity	110 km/h (70 mph) (1-min)

Kolia existed from 25 February to 13 March.

Cyclone Laure

Category 3 tropical cyclone (SSHWS)

Duration	March 8 – March 17
Peak intensity	185 km/h (115 mph) (1-min)

Laure existed from 8 March to 17 March.

Cyclone 22S

Tropical storm (SSHWS)

Duration	March 14 – March 20
Peak intensity	75 km/h (45 mph) (1-min)

22S existed from 14 March to 20 March.

References

1 2 3 4 5 Unattributed (2010). "Tropical Cyclone Tony 1979-80". Bureau of Meteorology. Retrieved 14 June 2011.
↑ Donque, G. "La saison cyclonique 1979-1980 a Madagascar" (PDF). Madagascar Rev. de Geo (in French). Direction de la Meteorologie Service de La Reunion. 38 (Janv-Juin 1981): 115–120. Archived from the original (PDF) on 2011-07-22. Retrieved 14 June 2011.
↑ Bath, Michael (23 July 2010). "Southern Hemisphere Tropical Cyclone Season 1979-1980". Australian Severe Weather. Retrieved 14 June 2011.
↑ Météo-France (2007). "Avec GAMEDE et 27 ans après HYACINTHE, La Réunion bat ses propres records mondiaux de précipitations sur les durées de 3 à 9 jours" (in French). Archived from the original on March 22, 2007. Retrieved April 12, 2008.

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[Tony-1] 1 2 3 4 5 Unattributed (2010). "Tropical Cyclone Tony 1979-80". Bureau of Meteorology. Retrieved 14 June 2011.

[MFR-2] Donque, G. "La saison cyclonique 1979-1980 a Madagascar" (PDF). Madagascar Rev. de Geo (in French). Direction de la Meteorologie Service de La Reunion. 38 (Janv-Juin 1981): 115–120. Archived from the original (PDF) on 2011-07-22. Retrieved 14 June 2011.

[1979-80_JTWC-3] Bath, Michael (23 July 2010). "Southern Hemisphere Tropical Cyclone Season 1979-1980". Australian Severe Weather. Retrieved 14 June 2011.

[mfreport-4] Météo-France (2007). "Avec GAMEDE et 27 ans après HYACINTHE, La Réunion bat ses propres records mondiaux de précipitations sur les durées de 3 à 9 jours" (in French). Archived from the original on March 22, 2007. Retrieved April 12, 2008.