1983–84 South-West Indian Ocean cyclone season#Intense Tropical Cyclone Bakoly

File:05S Nov 23 1983 0315Z.png

During the season, the Réunion Meteorological Service tracked storms in the basin, using the Dvorak technique to estimate tropical cyclone intensities via satellite imagery. The agency later became Météo-France's meteorological office at Réunion (MFR). At the time, the basin extended from the east coast of Africa to 80° E.{{cite report|author=Philippe Caroff|date=June 2011|title=Operational procedures of TC satellite analysis at RSMC La Reunion|publisher=World Meteorological Organization|access-date=2013-07-30|url=http://www.wmo.int/pages/prog/www/tcp/documents/RSMCLaReunionforIWSATC.pdf|display-authors=etal}} Eleven storms were named by the Mauritius Meteorological Service and the Madagascar Meteorological Service. The rest of the naming list was Lalao, Monja, Nora, Olidera, Pelazy, Rija, Saholy, Tsira, Vaosolo, Wilfredy, Yannika, and Zozo.{{cite report|author=Secretariat of the World Meteorological Organization|title=Tropical cyclone operational plan for the South-West Indian Ocean|date=1983-12-01|publisher=World Meteorological Organization|url=https://books.google.com/books?id=qMARAQAAIAAJ|isbn=978-92-63-10618-6}} The 11 named storms were slightly above the normal of 9, most of which formed in January and February. There were four intense tropical cyclones, which is twice the average. The increased activity of the season was in part due to enhanced easterlies, a strong monsoon trough, and warm water temperatures around {{convert|28|°C|°F|abbr=on}} which extended to 25° S.{{cite journal|author=Mark R. Jury|author2=Beenay Pathack|author3=Bin Wang|author4=Mark Powell|author5=Nirivololona Raholijao|title=A Destructive Cyclone Season in the SW Indian Ocean: January–February 1984|journal=South African Geographical Journal|year=1993|volume=95|publisher=University of Hawaii at Manoa School of Ocean and Earth Science and Technology|access-date=2013-07-21|url=http://www.soest.hawaii.edu/MET/Faculty/bwang/bw/paper/wang27.pdf}}

In addition to the 11 named storms, there were two additional storms in the season, classified by the Joint Typhoon Warning Center (JTWC).{{#tag:ref|The Joint Typhoon Warning Center is a joint United States Navy – United States Air Force task force that issues tropical cyclone warnings for the region.{{cite web|publisher=Joint Typhoon Warning Center|title=Joint Typhoon Warning Center Mission Statement|year=2011|access-date=2012-07-25|url=https://metocph.nmci.navy.mil/jtwc/menu/JTWC_mission.html|archive-url=https://web.archive.org/web/20070726103400/https://metocph.nmci.navy.mil/jtwc/menu/JTWC_mission.html|archive-date=2007-07-26}} |group="nb"}} The first developed in July in the Australian basin, and briefly crossed into the south-west Indian Ocean on July 14. Soon after it re-entered the Australian basin and dissipated.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 HSK0184 (1983192S05089)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-29|url={{IBTRACS url|id=1983192S05089}}|archive-url=https://web.archive.org/web/20160305083426/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1983192S05089|archive-date=2016-03-05|url-status=dead}} The other formed just southeast of Diego Garcia on November 20. It tracked to the southwest, and the JTWC estimated peak 1 minute sustained winds of {{convert|85|km/h|mph|abbr=on|round=5}}. The storm dissipated on November 25 northeast of Mauritius.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 HSK0484 (1983324S08073)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-29|url={{IBTRACS url|id=1983324S08073}}|archive-url=https://web.archive.org/web/20160305083351/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1983324S08073|archive-date=2016-03-05|url-status=dead}} In addition, Cyclone Daryl, which formed in the Australian basin on March 6, crossed into the south-west Indian Ocean on March 16 as a weakening storm without being renamed. Two days later it re-entered the Australian basin before dissipating.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 Daryl (1984067S09101)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-30|url={{IBTRACS url|id=1984067S09101}}|archive-url=https://web.archive.org/web/20160305082955/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1984067S09101|archive-date=2016-03-05|url-status=dead}}

In December and January, three storms – Andry, Caboto, and Domoina – struck Madagascar in short succession. Collectively they dropped heavy rainfall, and some areas of the country reported precipitation totals that were 220% above normal. The storms damaged roads, bridges, dams, and croplands, wrecking 10,000 tons of rice. Damage from the three storms was estimated at $25 million, and 13,560 people were left homeless. The storms cumulatively killed 42 people.{{cite report|publisher=ReliefWeb|author=Office of US Foreign Disaster Assistance|title=Annual Report for FY 1984|access-date=2013-07-28|url=http://reliefweb.int/sites/reliefweb.int/files/resources/EA042C733C19D854C125777E004C45A9-AR1984.pdf}} After seven cyclones struck or affected the country, causing 23.9 billion Malagasy francs ($200 million 1984 USD){{#tag:ref|Original currency in 1984 Malagasy francs, converted to United States dollars via FXTOP.com.{{cite web|publisher=FXTOP.com|access-date=2013-07-29|title=Currency Converter from Malagasy Francs to United States dollars|url=http://fxtop.com/en/currency-converter-past.php?A=23.9&C1=MGF&C2=USD&DD=30&MM=06&YYYY=1984&B=1&P=&I=1&btnOK=Go%21}} |group="nb"}} in crop damage, the African Development Bank approved a loan of 559 million Malagasy francs ($1.35 million 1989 USD){{#tag:ref|Original currency in 1989 Malagasy francs, converted to United States dollars via FXTOP.com.{{cite web|publisher=FXTOP.com|access-date=2013-07-29|title=Currency Converter from Malagasy Francs to United States dollars|url=http://fxtop.com/en/currency-converter-past.php?A=100&C1=MGF&C2=USD&DD=01&MM=01&YYYY=1989&B=1&P=&I=1&btnOK=Go%21}} |group="nb"}} to rebuild the damaged water infrastructure. The program lasted until December 22, 1993, and consisted of repairing irrigation systems and dams.{{cite report|publisher=African Development Bank Group|date=January 1995|title=Madagascar Emergency Irrigation Infrastructure Repairs Project|access-date=2013-07-29|url=http://www.afdb.org/fileadmin/uploads/afdb/Documents/Project-and-Operations/ADF-BD-IF-97-137-EN-SCANNEDIMAGE.215.PDF}}

{{Infobox hurricane small

|Basin=SWI

|Image=Cyclone Andry 7 Dec 1983 1137z.png

|Track=Andry 1983 track.png

|Formed=December 5

|Dissipated=December 14

|10-min winds=90

|1-min winds=130

|Pressure=927

}}

On December 5, an area of convection persisted between Agaléga and Diego Garcia, which corresponded to a satellite-derived Dvorak rating of T2.0; on this basis, MFR assessed the system as a tropical disturbance, and later that day, JTWC also initiated advisories.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 Andry (1983339S10065)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-27|url={{IBTRACS url|id=1983339S10065}}|archive-url=https://web.archive.org/web/20160305083239/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1983339S10065|archive-date=2016-03-05|url-status=dead}} The Réunion Meteorological Service named the system Andry. On December 7, the storm intensified into a tropical cyclone, the same day that the JTWC upgraded Andry to the equivalent of a minimal hurricane. After having moved to the west, the cyclone turned more to the west-southwest, and while doing so it passed just south of the Agaléga islands, producing wind gusts of {{convert|174|km/h|mph|abbr=on}}. The storm damaged or destroyed every house on the island, leaving the 350 residents without power, food, water, or shelter. Andry also downed most of the coconut trees on the island, which was the source of employment for most residents. High waves flooded wells and contaminated the water supply. The cyclone injured 30 people, and killed one. The Mauritius government later evacuated residents to structures that were not destroyed. Following the storm, various countries donated to the country to assist, including France who sent crews from Réunion to set up shelter and provide care for the residents. The island was largely rebuilt after about two years.{{cite news|author=Indradev Curpen|date=2013-03-01|title=Louis Hervé da Sylva : "Inhabitants of Agaléga should participate in the integral development of their islands"|newspaper=Le Defi Media Group|access-date=2013-07-29|url=http://www.defimedia.info/defi-quotidien/dq-interview/item/27695-louis-herve-da-sylva-inhabitants-of-agalega-should-participate-in-the-integral-development-of-their-islands.html|archive-url=https://web.archive.org/web/20130921060520/http://www.defimedia.info/defi-quotidien/dq-interview/item/27695-louis-herve-da-sylva-inhabitants-of-agalega-should-participate-in-the-integral-development-of-their-islands.html|archive-date=2013-09-21|url-status=dead}}

Cyclone Andry reached peak winds of December 9, when MFR estimated winds of {{convert|170|km/h|mph|abbr=on|round=5}}. The next day, JTWC estimated 1 minute winds of {{convert|240|km/h|mph|abbr=on|round=5}}. Around that time, Andry was passing just north of the northernmost tip of Madagascar at Diego-Suarez, where the storm produced wind gusts of {{convert|250|km/h|mph|abbr=on|round=5}}. The cyclone weakened while curving to the southwest and later to the south, making landfall on western Madagascar near Majunga with wind gusts of {{convert|198|km/h|mph|abbr=on}}. While over land and turning to the southeast, Andry rapidly weakened into a tropical depression, which later passed near the capital Antananarivo. The storm emerged back into the Indian Ocean on December 14, by which time the system was disorganized. That day, MFR estimated that Andry dissipated, although the JTWC assessed that the system re-intensified slightly and turned sharply southwestward before dissipating over Madagascar on December 16.

{{clear}}

{{Infobox hurricane small

|Basin=SWI

|Image=Bakoly Dec 23 1983 1141Z.png

|Track=Bakoly 1983 track.png

|Formed=December 19

|Dissipated=December 30

|10-min winds=90

|1-min winds=90

|Pressure=927

}}

On December 19, a tropical disturbance formed near Diego Garcia, which initially tracked to the south-southeast before turning to the southwest. Later that day, the system intensified to moderate tropical storm status, prompting the Mauritius Meteorological Service to name it Bakoly. The storm gradually intensified into an intense tropical cyclone, reaching peak winds of {{convert|170|km/h|mph|abbr=on|round=5}} on December 23. After maintaining that intensity for about 12 hours, Bakoly weakened below cyclone status as it turned to the south-southeast. On December 25, the storm passed between Réunion and Mauritius, and later resumed its south-southwest trajectory. After executing a small loop, Bakoly turned to the southeast and dissipated on December 30.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 Bakoly (1983353S08070)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-29|url={{IBTRACS url|id=1983353S08070}}|archive-url=https://web.archive.org/web/20160305082658/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1983353S08070|archive-date=2016-03-05|url-status=dead}}

On Mauritius, Bakoly produced {{convert|197|km/h|mph|abbr=on}} wind gusts and heavy rainfall, reaching {{convert|507|mm|in|abbr=on}} at Midlands. The high winds caused roof damage, and eight people were injured on the island. Bakoly caused power outages and damaged 4% of the telephone network. Damage was estimated at RS300 million (US$21 million).{{#tag:ref|Original currency in 1984 Mauritian rupees, converted to United States dollars via FXTOP.com.{{cite web|publisher=FXTOP.com|access-date=2013-07-30|title=Currency Converter from Mauritius rupees to United States dollars|url=http://fxtop.com/en/currency-converter-past.php?A=300000000&C1=MUR&C2=USD&DD=30&MM=06&YYYY=1984&B=1&P=&I=1&btnOK=Go%21}} |group="nb"}}{{cite journal|title=Quarterly Economic Review of Madagascar, Mauritius, Seychelles, Comoros|journal=Economist Intelligence Unit Limited|number=1|year=1984|url=https://books.google.com/books?id=4PUbAQAAMAAJ}} Passing within 100 km (60 mi) of Réunion, Bakoly produced {{convert|100|km/h|mph|abbr=on|round=5}} winds and dropped {{convert|300|mm|in|abbr=on}} of rainfall.

{{clear}}

{{Infobox hurricane small

|Basin=SWI

|Image=Caboto Jan 5 1984 1223Z.png

|Track=Caboto 1984 track.png

|Formed=January 4

|Dissipated=January 10

|10-min winds=35

|Pressure=991

}}

MFR began tracking a tropical disturbance in the Mozambique channel on January 4. The next day, the agency estimated the system intensified into a moderate tropical storm,{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 Caboto (1984005S15044)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-27|url={{IBTRACS url|id=1983339S10065}}|archive-url=https://web.archive.org/web/20160305083239/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1983339S10065|archive-date=2016-03-05|url-status=dead}} prompting the Madagascar Meteorological Service to name it Caboto. The storm moved southward along Madagascar's western coast, reaching peak winds of about {{convert|65|km/h|mph|abbr=on|round=5}}. Caboto made landfall on January 7 to the north of the mouth of the Mangoky River, and crossed the southern portion of the country, emerging near Farafangana into the Indian Ocean. Winds associated with the storm reached {{convert|43|km/h|mph|abbr=on}} at Morondava on the west coast and {{convert|63|km/h|mph|abbr=on}} at Farafangana on the east coast. A developing ridge caused Caboto to slow after it reached open waters, executing a partial loop southwest of Réunion before turning to the south and dissipating on January 10.

{{clear}}

{{Infobox hurricane small

|Basin=SWI

|Image=Domoina jan 28 1984 0900Z.jpg

|Track=Domoina 1984 track.png

|Formed=January 19

|Dissipated=January 30

|10-min winds=50

|1-min winds=55

|Pressure=976

}}

{{Main|Tropical Storm Domoina}}

Domoina developed on January 16 off the northeast coast of Madagascar. With a ridge to the north,{{cite journal|title=La Saison Cyclonique 1983–1984 A Madagascar|date=September 1984|author=La Météorlogie, Service de la Réunion|page=146|journal=Madagascar: Revue de Géographie|access-date=2013-07-17|language=fr|url=http://madarevues.recherches.gov.mg/IMG/pdf/rev-geo43_9_.pdf|volume=43|issue=Juil-Déc 1983}} the storm tracked generally westward and later southwestward. On January 21, Domoina struck eastern Madagascar. After crossing the country, Domoina strengthened in the Mozambique channel to peak winds of {{convert|95|km/h|mph|abbr=on|round=5}}. On January 28, the storm made landfall in southern Mozambique, and slowly weakened over land. Domoina crossed into Swaziland and later eastern South Africa before dissipating on February 2.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 Domonia (1984016S15073)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-17|url={{IBTRACS url|id=1984016S15073}}|archive-url=https://web.archive.org/web/20160305083615/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1984016S15073|archive-date=2016-03-05|url-status=dead}}

In Mozambique, Domoina dropped heavy rainfall in the capital Maputo that accounted for 40% of the annual total. Floods in the country destroyed over 50 small dams and left widespread crop damage just before the summer harvest.{{cite journal|pages=182–183|title=Hurricane Alley|author=Dick DeAngelis|journal=Mariners Weather Log|date=Summer 1984|volume=28|number=3|publisher=United States Department of Commerce}}

Later, the rains caused the worst flooding in over 20 years in Swaziland,{{cite news|newspaper=The Spokesman-Review|date=1984-01-31|title=Hurricane Hits Swaziland|access-date=2013-07-24|url=https://news.google.com/newspapers?id=rFdWAAAAIBAJ&sjid=7e4DAAAAIBAJ&pg=6608,7625158&dq=mozambique&hl=en}} which damaged or destroyed more than 100 bridges.{{cite news|work=The New York Times|date=1984-02-05|title=Swazi Storm Toll Rises to 39|agency=Reuters|access-date=2013-07-21|url=https://www.nytimes.com/1984/02/05/world/swazi-storm-toll-rises-to-39.html}} Disrupted transport left areas isolated for several days.{{cite report|date=February 1984|author=United Nations Department of Humanitarian Affairs|title=Swaziland Floods Feb 1984 UNDRO Situation Reports 1–6|publisher=ReliefWeb|access-date=2013-07-19|url=http://reliefweb.int/report/swaziland/swaziland-floods-feb-1984-undro-situation-reports-1-6}} In South Africa, rainfall peaked at 950 mm (37 in),{{cite report|title=Documentation of the 1984 Domoina Floods|url=http://www.dwaf.gov.za/iwqs/reports/tr/TR_122_1984_Domoina_floods.pdf|publisher=Department of Water Affairs (South Africa)|author=Z.P. Kovács|author2=D.B. Du Plessis|author3=P.R. Bracher|author4=P. Dunn|author5=G.C.L. Mallory|date=May 1985|access-date=2013-07-23|archive-url=https://web.archive.org/web/20130921054547/http://www.dwaf.gov.za/iwqs/reports/tr/TR_122_1984_Domoina_floods.pdf|archive-date=2013-09-21|url-status=dead}} which flooded 29 river basins, notably the Pongola River which altered its course after the storm.{{cite report|title=The effects of the Domoina floods and releases from the Pongolapoort Dam on the Pongolo floodplain|url=http://www.dwa.gov.za/iwqs/reports/tr/B-N3_0704_Domoina%20floods%20and%20the%20Pongolo%20floodplain.pdf|publisher=Department of Water Affairs (South Africa)|author=J.N. Rossouw|date=January 1985|access-date=2013-07-25|archive-date=2013-09-21|archive-url=https://web.archive.org/web/20130921055727/http://www.dwa.gov.za/iwqs/reports/tr/B-N3_0704_Domoina%20floods%20and%20the%20Pongolo%20floodplain.pdf|url-status=dead}} Flooding caused the Pongolapoort Dam to reach 87% of its capacity; when waters were released to maintain the structural integrity, additional flooding occurred in Mozambique, forcing thousands to evacuate.{{cite report|title=Coping with Floods – The Experience of Mozambique|author=Álbaro Carmo Vaz|publisher=1st WARFSA/WaterNet Symposium: Sustainable Use of Water Resources|date=November 2000|access-date=2013-07-24|url=http://www.docstoc.com/docs/50875552/COPING-WITH-FLOODS---THE-EXPERIENCE-OF-MOZAMBIQUE1-1-THE-FLOOD}} Throughout the region, Domoina caused widespread flooding that damaged houses, roads, and crops, leaving about $199 million in damage. There were 242 deaths in southeastern Africa.{{cite report|author=Office of U.S. Foreign Disaster Assistance|title=Significant Data on Major Disasters Worldwide 1900–present|date=August 1993|access-date=2013-07-19|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}}

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Image=Edoara Jan 21 1984 1047Z.png

|Track=Edoara 1984 track.png

|Formed=January 21

|Dissipated=January 25

|10-min winds=35

|1-min winds=35

|Pressure=991

}}

A circulation developed south of Diego Garcia on January 20, and the next was classified as a tropical disturbance by MFR. Given the name Edoara by the Mauritius Meteorological Service, it quickly intensified into a moderate tropical storm, although it never strengthened beyond winds of {{convert|65|km/h|mph|abbr=on|round=5}}. While maintaining a southwest track, Edoara passed southeast of Rodrigues, Mauritius, and Réunion. On Rodrigues, the storm produced wind gusts of {{convert|131|km/h|mph|abbr=on}}, and heavy rainfall reaching {{convert|253|mm|in|abbr=on}} at Baie aux Huîtres. After moving away from the islands, Edoara dissipated on January 25.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 Edoara (1984020S11077)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-29|url={{IBTRACS url|id=1984020S11077}}|archive-url=https://web.archive.org/web/20160305083429/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1984020S11077|archive-date=2016-03-05|url-status=dead}}

{{clear}}

{{Infobox hurricane small

|Basin=SWI

|Image=Vivienne Jan 26 1984 0945Z.png

|Track=Vivienne-Fanja 1984 track.png

|Formed=January 27 (entered basin)

|Dissipated=January 30

|10-min winds=45

|1-min winds=75

|Pressure=984

}}

The origins of Vivienne-Fanja are unclear as a result of sparseness of data, due to a disruption in satellite imagery coverage. It is estimated that a tropical low formed on January 23 west of Christmas Island in the Australian basin. The Bureau of Meteorology named the storm Vivienne, which gradually intensified while moving to the west.{{cite report|title=Tropical Cyclone Vivienne|publisher=Bureau of Meteorology|access-date=2013-07-29|url=http://www.bom.gov.au/cyclone/history/vivienne84.shtml}} On January 27, the cyclone crossed 80° E into the southwest Indian Ocean, at which time it was renamed Fanja. While in the basin, the storm reached peak winds of {{convert|80|km/h|mph|abbr=on|round=5}}. It continued moving to the southwest before dissipating on January 30.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 Fanja:Vivienne (1984022S08086)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-29|url={{IBTRACS url|id=1984022S08086}}|archive-url=https://web.archive.org/web/20160305144328/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1984022S08086|archive-date=2016-03-05|url-status=dead}}

{{clear}}

{{Infobox hurricane small

|Basin=SWI

|Image=Galy Feb 1 1984 1153Z.png

|Track=Galy 1984 track.png

|Formed=January 29

|Dissipated=February 4

|10-min winds=35

|Pressure=991

}}

On January 29, a circulation developed between Agaléga and Tromelin island. Initially the system moved to the southwest, followed by a turn to the southeast. Given the name Galy, the storm attained winds of {{convert|65|km/h|mph|abbr=on|round=5}} on January 30, but weakened into a tropical disturbance the next day. By that time, Galy turned to the west toward the Madagascar coastline, and on February 1 re-intensified into a moderate tropical storm.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 Galy (1984025S14073)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-27|url={{IBTRACS url|id=1984025S14073}}|archive-url=https://web.archive.org/web/20160305083455/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1984025S14073|archive-date=2016-03-05|url-status=dead}} The next day, Galy made landfall near Mananjary, but soon after recurved to the southeast and emerged into the Indian Ocean near Fort Dauphin. On February 4, the storm dissipated in a polar trough. While over land, Galy dropped light rainfall of around {{convert|44.5|mm|in|abbr=on}}.

{{clear}}

{{Infobox hurricane small

|Basin=SWI

|Image=Haja Feb 17 1984 1157Z.png

|Track=Haja 1984 track.png

|Formed=February 7

|Dissipated=February 19

|10-min winds=50

|1-min winds=45

|Pressure=976

}}

A tropical depression formed on February 7 south of Diego Garcia. For about a week, the system remained weak and changed directions several times; after an eastward movement, it turned to the northwest, curved to the southeast, and later began a steady track to the southwest. On February 13, it intensified into a moderate tropical storm, and quickly attained peak winds of {{convert|95|km/h|mph|abbr=on|round=5}}. Given the name Haja, the storm passed southeast of Rodrigues and Réunion. Haja approached the southeast coast of Madagascar, but turned to the southeast and weakened, dissipating on February 19.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 Haja (1984038S12073)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-29|url={{IBTRACS url|id=1984038S12073}}|archive-url=https://web.archive.org/web/20160305083938/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1984038S12073|archive-date=2016-03-05|url-status=dead}}

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{{Infobox hurricane small

|Basin=SWI

|Image=Imboa Feb 13 1984 1247Z.png

|Track=Imboa 1984 track.png

|Formed=February 10

|Dissipated=February 19

|10-min winds=50

|1-min winds=45

|Pressure=976

}}

On February 10, MFR began tracking a tropical disturbance in the Mozambique channel near Juan de Nova Island. The system tracked generally south-southwestward, gradually intensifying. Given the name Imboa, the storm reached peak winds of {{convert|95|km/h|mph|abbr=on|round=5}} on February 13 while passing near Europa Island. After executing a small loop, Imboa turned toward the southeastern African coastline and approached the eastern coasts of Mozambique and South Africa as a weakened system. A ridge caused the storm to turn to the east and northeast, dissipating on February 19.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 Imboa (1984041S17042)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-29|url={{IBTRACS url|id=1984041S17042}}|archive-url=https://web.archive.org/web/20160305083206/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1984041S17042|archive-date=2016-03-05|url-status=dead}}

Early in its duration, Imboa produced winds of {{convert|111|km/h|mph|abbr=on}} at Maintirano while passing off the west coast of Madagascar. While offshore South Africa, Imboa dropped heavy rainfall along the coast just weeks after Domoina flooded the region, reaching over {{convert|350|mm|in|abbr=on}} in some locations. The rains caused flooding along the Mhlatuze and Mfuluzone rivers, which destroyed a temporary bridge along the Umfolozi River built after Domoina. Along the coast, Imboa produced high tides that caused beach erosion.{{cite book|title=Ecology and Conservation of Estuarine Ecosystems: Lake St Lucia as a Global Model|editor1=Renzo Perissinotto |editor2=Derek D. Stretch |editor3=Ricky H. Taylor |year=2013|publisher=Cambridge University|isbn=978-1-107-01975-1|location=New York|url=https://books.google.com/books?id=KcC37CogsSoC&pg=PA38|page=38}} There were four deaths in the country.

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{{Infobox hurricane small

|Basin=SWI

|Image=Jaminy Feb 16 1984 1028Z.png

|Track=Annette 1984 track.png

|Formed=February 16 (entered basin)

|Dissipated=February 24

|10-min winds=90

|1-min winds=100

|Pressure=927

}}

Cyclone Annette developed simultaneously with Cyclone Willy in the Australian basin and Cyclone Haja in the south-west Indian. On February 3, a tropical low formed northeast of the Cocos Islands. Steered by a ridge to the south, it moved generally southwestward and intensified into Tropical Cyclone Annette, named by the Bureau of Meteorology. After executing a loop, Annette crossed 80 E into the south-west Indian Ocean on February 16. Upon crossing into the basin, the storm was renamed Jaminy by the Mauritius Meteorological Service. Around that time, the cyclone attained peak winds of {{convert|170|km/h|mph|abbr=on|round=5}}. Jaminy moved generally southwestward and weakened below cyclone status on February 20. The next day, it turned to the southeast, later dissipating on February 24.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 Annette:Jaminy (1984035S09101)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-29|url={{IBTRACS url|id=1984035S09101}}|archive-url=https://web.archive.org/web/20160305084057/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1984035S09101|archive-date=2016-03-05|url-status=dead}}

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{{Infobox hurricane small

|Basin=SWI

|Image=Kamisy Apr 8 1984 0401Z.png

|Track=Kamisy 1984 track.png

|Formed=April 3

|Dissipated=April 16

|10-min winds=90

|1-min winds=100

|Pressure=927

}}

{{main|Cyclone Kamisy}}

A tropical disturbance formed near Diego Garcia on April 3 and subsequently moved westward, intensifying into a moderate tropical storm two days later. Given the name Kamisy, the storm gradually intensified into an intense tropical cyclone by April 9. Kamisy reached winds of {{convert|170|km/h|mph|abbr=on|round=5}} before making landfall in extreme northern Madagascar near Diego Suarez. It weakened upon entering the Mozambique channel, but briefly re-intensified on April 10. That day while passing near Mayotte, the cyclone turned to the southeast, striking Madagascar again near Majunga. Kamisy quickly crossed the country and quickly weakened into a tropical disturbance. After emerging into the Indian Ocean off the east coast of Madagascar, the system re-intensified into a moderate tropical storm before dissipating on April 16.{{cite report|author=Kenneth R. Knapp|author2=Michael C. Kruk|author3=David H. Levinson|author4=Howard J. Diamond|author5=Charles J. Neumann|year=2010|work=The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data|title=1984 Kamisy (1984094S10080)|publisher=Bulletin of the American Meteorological Society|access-date=2013-07-28|url={{IBTRACS url|id=1984094S10080}}|archive-url=https://web.archive.org/web/20160305143630/http://atms.unca.edu/ibtracs/ibtracs_v03r04/browse-ibtracs/index.php?name=v03r04-1984094S10080|archive-date=2016-03-05|url-status=dead}}

In northern Madagascar, Kamisy produced wind gusts of {{convert|250|km/h|mph|abbr=on|round=5}}, which destroyed 80% of the city of Diego Suarez. About 39,000 people were left homeless in the area, and there were five deaths. In western Madagascar, the cyclone dropped {{convert|232.2|mm|in|abbr=on}} of rainfall in 24 hours in Majunga, which damaged rice fields in the region after causing widespread river flooding. The storm destroyed about 80% of Majunga where the storm struck. Throughout the country, Kamisy caused $250 million in damage and 68 deaths, with 215 people injured and 100,000 left homeless. Kamisy also affected Mayotte with winds of over {{convert|100|km/h|mph|abbr=on|round=5}}, which left about 25,000 homeless and left widespread damage. One death was reported on the island.{{cite news|title=Cyclone devastates Indian Ocean islands|date=1984-04-13|agency=United Press International}} {{subscription required|via=Lexis Nexis}}

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{{Portal|Tropical cyclones}}

• Atlantic hurricane seasons: 1983, 1984
• Eastern Pacific hurricane seasons: 1983, 1984
• Western Pacific typhoon seasons: 1983, 1984
• North Indian Ocean cyclone seasons: 1983, 1984

{{Reflist|group=nb}}

{{reflist|2}}

{{TC Decades|Year=1980|basin=South-West Indian Ocean|type=cyclone|shem=yes}}

{{Tropical cyclone season|1983|split-year=y}}

{{DEFAULTSORT:1983-84 South-West Indian Ocean cyclone season}}

Category:South-West Indian Ocean cyclone seasons

Category:Tropical cyclones in 1983

Category:Tropical cyclones in 1984