1979–80 South-West Indian Ocean cyclone season

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{{Infobox Hurricane Small

|Basin=Aus

|Image=Tony Aug 27 1979 0924Z.png

|10-min winds=50

|Track=Tony 1979 track.png

|Pressure=990

|Formed=August 27

|Dissipated=August 31

}}

On 26 August, the BoM reported that a tropical low had developed on a shear line about {{convert|1300|km|mi|round=5|abbr=on|comma=off}} to the northwest of Cocos Island.{{cite web|year=2010|title=Tropical Cyclone Tony 1979-80|url=http://www.bom.gov.au/cyclone/history/tony.shtml|publisher=Australian Bureau of Meteorology|accessdate=14 June 2011}} 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. During the next couple of days, the system moved towards the west-southwest before on 29 August it reached its peak intensity of {{convert|50|kn|km/h mph|round=5|order=out|abbr=on|sortable=on}} and a peak pressure of {{convert|990|hPa|inHg|abbr=on|sigfig=4}} as it approached the edge of TCWC Perth's area of responsibility. During the next day, Tony moved into the South West Indian Ocean and weakened gradually before it dissipated during 31 August. 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.{{cite journal|title=La saison cyclonique 1979-1980 a Madagascar|publisher=Direction de la Meteorologie Service de La Reunion|volume=38|accessdate=14 June 2011|issue=Janv-Juin 1981|pages=115–120|first=G.|journal=Madagascar Rev. De Geo|language=French|last=Donque|url=http://madarevues.recherches.gov.mg/revues/pdfxfiles/rev-geo38%287%29.pdf|archive-url=https://web.archive.org/web/20110722175641/http://madarevues.recherches.gov.mg/revues/pdfxfiles/rev-geo38(7).pdf|archive-date=2011-07-22|url-status=dead}}{{cite web|title=Southern Hemisphere Tropical Cyclone Season 1979-1980|last=Bath|first=Michael|date=23 July 2010|url=http://www.australiasevereweather.com/tropical_cyclones/jtwc_1979_1980_southern_hemisphere_tropical_cyclones.htm|publisher=Australian Severe Weather|accessdate=14 June 2011}}

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{{Infobox hurricane small

|Basin=SWI

|Image=Albine Nov 29 1979 1102Z.png

|Track=Albine 1979 track.png

|Formed=November 25

|Dissipated=December 6

|10-min winds=105

|1-min winds=90

|Pressure=960

}}

Albine existed from 25 November to 6 December.

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{{Infobox hurricane small

|Basin=SWI

|Track=Viola-Claudette 1979 track.png

|Image=Claudette Dec 20 1979 1034Z.png

|Formed=December 18 (Crossed 80°E)

|Dissipated=December 28

|10-min winds=115

|1-min winds=110

|Pressure=955

}}

Cyclone Viola entered the basin on December 18 from the Australian region, whereupon it became Cyclone Claudette.{{cite report|title=Severe Tropical Cyclone Viola|publisher=Bureau of Meteorology|location=Melbourne, Victoria|url=http://www.bom.gov.au/cyclone/history/viola.shtml|access-date=September 19, 2022}} After passing southeast of St. Brandon, Claudette struck Mauritius on December 22, producing wind gusts of {{convert|221|km/h|mph|abbr=on}}. The storm caused 5 fatalities, 257 injuries, and US$175 million in damage on the island. About 5,000 houses were destroyed or severely damaged. Effects on neighboring Réunion were limited to {{convert|79|km/h|mph|abbr=on}} wind gusts and some rainfall.{{cite web|publisher=Mauritius Meteorological Services|title=List of Historical Cyclones|accessdate=February 4, 2019|url=http://metservice.intnet.mu/publications/list-of-historical-cyclones.php}}{{cite web|author=Office of U.S. Foreign Disaster Assistance|title=Significant Data on Major Disasters Worldwide 1900-present|date=August 1993|page=140|accessdate=February 5, 2019|url=http://pdf.usaid.gov/pdf_docs/PNABP986.pdf|archive-url=https://web.archive.org/web/20110718110440/http://pdf.usaid.gov/pdf_docs/PNABP986.pdf|url-status=dead|archive-date=July 18, 2011}}{{cite news|title=Bee Swarms|date=January 1, 1980|newspaper=The Canberra Times|agency=Australian Associated Press|url=https://trove.nla.gov.au/newspaper/article/137005695?searchTerm=cyclone%20claudette%20%20%20%20%20%20%20%20%20%20%20%20&searchLimits=}}{{cite report|series=Global tropical/extratropical cyclone climatic atlas|title=Tropical Cyclone Claudette, 10–28 December|year=1996|work=National Climatic Data Center|accessdate=February 5, 2019|url={{GTECCA url|basin=SWI|year=1979_13}}}}

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{{Infobox hurricane small

|Basin=SWI

|Track=Berenice 1979 track.png

|Image=Berenice Dec 18 1979 1234Z.png

|Formed=December 15

|Dissipated=December 21

|10-min winds=35

|1-min winds=35

|Pressure=1000

}}

Berenice existed from 15 December to 21 December.

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{{Infobox hurricane small

|Basin=SWIO

|Type1=swiodepression

|Image=Wilf Dec 28 1979 0905Z.png

|Track=Wilf-Danitza 1979 track.png

|Formed=December 23

|Dissipated=January 3

|10-min winds=29

|1-min winds=35

|Pressure=1000

}}

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

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{{Infobox hurricane small

|Basin=SWI

|Type1=

|Image=Hyacinthe 25 jan 1980 0326Z N6.jpg

|Track=Hyacinthe 1980 track.png

|Formed=January 15

|Dissipated=January 31

|10-min winds=90

|1-min winds=70

|Pressure=960

}}

{{main|Cyclone Hyacinthe}}

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).{{cite web|author=Météo-France |year=2007 |title=Avec GAMEDE et 27 ans après HYACINTHE, La Réunion bat ses propres records mondiaux de précipitations sur les durées de 3 à 9 jours |language=French |accessdate=April 12, 2008 |url=http://www.meteo.fr/temps/domtom/La_Reunion/Evenement_du_mois/AccueilEvenement.html |url-status=dead |archiveurl=https://web.archive.org/web/20070328081503/http://www.meteo.fr/temps/domtom/La_Reunion/Evenement_du_mois/AccueilEvenement.html |archivedate=March 28, 2007 }} 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, {{convert|6083|mm|in|abbr=on}} 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.

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Type1=

|Image=Jacinthe Feb 3 1980 1604Z.png

|Track=Jacinthe 1980 track.png

|Formed=February 1

|Dissipated=February 7

|10-min winds=100

|1-min winds=100

|Pressure=955

}}

Jacinthe existed from 1 February to 7 February. On February 3, the cyclone passed between Mauritius and Rodrigues, producing wind gusts of {{convert|117|km/h|abbr=on}} and {{convert|119|km/h|mph|abbr=on}} on the respective islands.{{cite report|series=Global tropical/extratropical cyclone climatic atlas|title=Tropical Cyclone Jacinthe, 1–7 February|year=1996|work=National Climatic Data Center|accessdate=February 2, 2019|url={{GTECCA url|basin=SWI|year=1980_2}}}}

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{{Infobox hurricane small

|Basin=SWI

|Type1=

|Image=

|Track=Kolia 1980 track.png

|Formed=February 25

|Dissipated=March 13

|10-min winds=60

|1-min winds=60

|Pressure=985

}}

Kolia existed from 25 February to 13 March. The storm executed two loops near the Mascarene Islands, bringing the storm between Réunion and Mauritius twice. Wind gusts reached {{convert|80|km/h|mph|abbr=on}} on Mauritius.{{cite report|series=Global tropical/extratropical cyclone climatic atlas|title=Tropical Depression Kolia, 25 February to 13 March|year=1996|work=National Climatic Data Center|accessdate=February 2, 2019|url={{GTECCA url|basin=SWI|year=1980_4}}}}

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{{Infobox hurricane small

|Basin=SWI

|Type1=

|Image=Laure Mar 12 1980 1537Z.png

|Track=Laure 1980 track.png

|Formed=March 8

|Dissipated=March 17

|10-min winds=90

|1-min winds=100

|Pressure=965

}}

Laure existed from 8 March to 17 March. On March 13, the cyclone passed just east of Mauritius, producing wind gusts of {{convert|109|km/h|mph|abbr=on}} and {{convert|65.7|mm|in|abbr=on}} of rainfall.{{cite report|series=Global tropical/extratropical cyclone climatic atlas|title=Tropical Cyclone Laure, 8–17 March|year=1996|work=National Climatic Data Center|accessdate=February 2, 2019|url={{GTECCA url|basin=SWI|year=1980_4}}}}

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{{Infobox hurricane small

|Basin=SWI

|Type1=

|Image=

|Track=22S 1980 track.png

|Formed=March 14

|Dissipated=March 20

|10-min winds=45

|1-min winds=40

|Pressure=

}}

22S existed from 14 March to 20 March.

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• Atlantic hurricane seasons: 1979, 1980
• Eastern Pacific hurricane seasons: 1979, 1980
• Western Pacific typhoon seasons: 1979, 1980
• North Indian Ocean cyclone seasons: 1979, 1980

{{reflist}}

{{Tropical cyclone season|1979|split-year=y}}

{{TC Decades|Year=1970|basin=South-West Indian Ocean|type=cyclone|shem=yes}}

{{DEFAULTSORT:1979-80 South-West Indian Ocean cyclone season}}

Category:South-West Indian Ocean cyclone seasons

Category:1979–80 Southern Hemisphere tropical cyclone season

Category:Tropical cyclones in 1980