1983–84 South-West Indian Ocean cyclone season
| 1983–84 South-West Indian Ocean cyclone season |
Season summary map
|
| Seasonal boundaries |
| First system formed |
December 5, 1983 |
| Last system dissipated |
April 16, 1984 |
| Strongest storm |
|
| Name |
Andry, Bakoly, Jaminy, Kamisy |
| • Maximum winds |
195 km/h (120 mph)
(10-minute sustained) |
| • Lowest pressure |
927 hPa (mbar) |
| Seasonal statistics |
| Total depressions |
14 |
| Total storms |
13 |
| Tropical cyclones |
4 |
| Intense tropical cyclones |
4 |
| Total fatalities |
356 total |
| Total damage |
$496 million (1984 USD) |
| Related articles |
|
|
South-West Indian Ocean tropical cyclone seasons
1981–82, 1982–83, 1983–84, 1984–85, 1985–86
|
| Intense tropical cyclone (MFR) |
| Category 4 tropical cyclone (SSHWS) |
|
|
| Duration |
December 5 – December 14 |
| Peak intensity |
170 km/h (105 mph) (10-min) 927 hPa (mbar) |
| Intense tropical cyclone (MFR) |
| Category 2 tropical cyclone (SSHWS) |
|
|
| Duration |
December 19 – December 30 |
| Peak intensity |
170 km/h (105 mph) (10-min) 927 hPa (mbar) |
| Moderate tropical storm (MFR) |
|
|
| Duration |
January 4 – January 10 |
| Peak intensity |
65 km/h (40 mph) (10-min) 991 hPa (mbar) |
| Severe tropical storm (MFR) |
| Tropical storm (SSHWS) |
|
|
| Duration |
January 19 – January 30 |
| Peak intensity |
95 km/h (60 mph) (10-min) 976 hPa (mbar) |
| Moderate tropical storm (MFR) |
| Tropical storm (SSHWS) |
|
|
| Duration |
January 21 – January 25 |
| Peak intensity |
65 km/h (40 mph) (10-min) 991 hPa (mbar) |
| Moderate tropical storm (MFR) |
| Category 1 tropical cyclone (SSHWS) |
|
|
| Duration |
January 27 (entered basin) – January 30 |
| Peak intensity |
80 km/h (50 mph) (10-min) 984 hPa (mbar) |
| Moderate tropical storm (MFR) |
|
|
| Duration |
January 29 – February 4 |
| Peak intensity |
65 km/h (40 mph) (10-min) 991 hPa (mbar) |
| Severe tropical storm (MFR) |
| Tropical storm (SSHWS) |
|
|
| Duration |
February 7 – February 19 |
| Peak intensity |
95 km/h (60 mph) (10-min) 976 hPa (mbar) |
| Severe tropical storm (MFR) |
| Tropical storm (SSHWS) |
|
|
| Duration |
February 10 – February 19 |
| Peak intensity |
95 km/h (60 mph) (10-min) 976 hPa (mbar) |
The 1983–84 South-West Indian Ocean cyclone season featured above normal activity and several deadly storms. There was steady storm activity from December through April due to favorable conditions, such as warm sea surface temperatures and an active monsoon. The first named storm – Andry – was tied for the strongest with Bakoly, Jaminy, and Kesiny. Cyclone Andry passed near Agaléga island within Mauritius, damaging or destroying every building there and killing one person. It later struck Madagascar, the first of three storms to strike the nation within two months, which collectively caused $25 million in damage and 42 deaths. The third of these storms, Tropical Storm Domoina, caused deadly flooding in southeastern Africa that killed 242 people and caused $199 million in damage. The storm destroyed more than 50 small dams in Madagascar and caused the worst flooding in Swaziland in 20 years. In addition three of the first storms affecting Madagascar, Cyclone Bakoly in December left $21 million in damage on Mauritius.
Less than two weeks after Domoina caused severe flooding in South Africa, Tropical Storm Imboa produced additional rainfall and high seas in the country, killing four people. The final storm of the season was Cyclone Kamisy, which caused $250 million in damage and 68 deaths when it made landfalls in northern and northwestern Madagascar. The cities near landfall were largely destroyed, and about 100,000 people were left homeless. The penultimate storm, Jaminy, was tied for the strongest storm in the basin after it crossed from the Australian region, where it was named Annette. Cyclone Fanja in January also crossed from the Australian region, where it was named Vivienne.
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. 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. 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 28 °C (82 °F) which extended to 25° S.
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