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1985–86 South-West Indian Ocean cyclone season

1985–86 South-West Indian Ocean cyclone season
1985-1986 South-West Indian Ocean cyclone season summary.jpg
Season summary map
Seasonal boundaries
First system formed December 23, 1985
Last system dissipated May 10, 1986
Strongest storm
Name Erinesta
 • Maximum winds 170 km/h (105 mph)
(10-minute sustained)
 • Lowest pressure 927 hPa (mbar)
Seasonal statistics
Total depressions 12 (1 unofficial)
Total storms 12 (1 unofficial)
Tropical cyclones 5
Total fatalities 99
Total damage $150 million (1986 USD)
Related articles
South-West Indian Ocean tropical cyclone seasons
1983–84, 1984–85, 1985–86, 1986–87, 1987–88
Moderate tropical storm (MFR)
Alifredy Dec 23 1985 1200Z.png Alifredy 1985 track.png
Duration December 23 – December 27
Peak intensity 65 km/h (40 mph) (10-min)  997 hPa (mbar)
Moderate tropical storm (MFR)
Tropical storm (SSHWS)
06S Jan 9 1986 1220Z.png Berobia 1986 track.png
Duration January 5 – January 10
Peak intensity 85 km/h (50 mph) (10-min)  984 hPa (mbar)
Severe tropical storm (MFR)
Category 1 tropical cyclone (SSHWS)
Temporary cyclone south.svg Costa 1986 track.png
Duration January 7 – January 19
Peak intensity 95 km/h (60 mph) (10-min)  976 hPa (mbar)
Tropical cyclone (MFR)
Category 3 tropical cyclone (SSHWS)
Temporary cyclone south.svg Delifinina 1986 track.png
Duration January 10 – January 19
Peak intensity 135 km/h (85 mph) (10-min)  954 hPa (mbar)
Intense tropical cyclone (MFR)
Category 4 tropical cyclone (SSHWS)
Erinesta Feb 3 1986 1115Z.png Erinesta 1986 track.png
Duration January 29 – February 11
Peak intensity 170 km/h (105 mph) (10-min)  927 hPa (mbar)
Moderate tropical storm (MFR)
Tropical storm (SSHWS)
Filomena Feb 6 1986 0901Z.png Filomena 1986 track.png
Duration February 5 – February 12
Peak intensity 65 km/h (40 mph) (10-min)  991 hPa (mbar)
Severe tropical storm (MFR)
Category 2 tropical cyclone (SSHWS)
Gista Feb 23 1986 1239Z.png Gista 1986 track.png
Duration February 18 – February 25
Peak intensity 95 km/h (60 mph) (10-min)  976 hPa (mbar)
Tropical cyclone (MFR)
Category 3 tropical cyclone (SSHWS)
Honorinina Mar 13 1986 1111Z.png Honorinina 1986 track.png
Duration March 7 – March 23
Peak intensity 150 km/h (95 mph) (10-min)  941 hPa (mbar)
Moderate tropical storm (MFR)
Tropical storm (SSHWS)
Iarima Mar 13 1986 0929Z.png Iarima 1986 track.png
Duration March 13 – March 18
Peak intensity 65 km/h (40 mph) (10-min)  991 hPa (mbar)

The 1985–86 South-West Indian Ocean cyclone season was the first in which the Météo-France office (MFR) on Réunion tracked cyclones as far east as 90° E in Indian Ocean, south of the equator. Previously, the agency's area of responsibility was limited to 80° E. It was an active season with twelve named storms, of which five strengthened into tropical cyclone with 10 minute sustained winds of at least 120 km/h (75 mph). The first named storm was Tropical Storm Alifredy, which originated in the Mozambique Channel in late December and moved across Madagascar. However, the unofficial Joint Typhoon Warning Center (JTWC) tracked a short-lived storm in September.

Most of the activity occurred in 1986, with four storms in January, three of which briefly existed simultaneously on January 10. The first of these three, Tropical Storm Berobia, struck eastern Mozambique. Tropical Storm Costa was a series of three tropical depressions within the same broader system that persisted for 12 days, bringing gusty winds and rainfall to the Mascarene Islands. The strongest storm of the season, Erinesta, formed in late January and struck the tiny Tromelin Island, decimating the native rabbit population. Erinesta later produced 1,643 mm (64.7 in) of rainfall in the mountainous peaks of Réunion, one of the highest 24‑hour rainfall totals at the time at Cilaos. Two other storms in February – Filomena and Gista – moved southward for their durations and did not significantly impact land. In March, Cyclone Honorinina killed 99 people and caused $150 million (1986 USD) in damage when it struck eastern Madagascar. There were two other storms in March, Iarima and Jefotra, the latter of which brushed Rodrigues island with gusty winds. The final two storms of the season, Krisostoma and Lila, entered from the Australian basin in April and May, respectively, with Lila exiting the basin to end the season on May 10.


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