1974–75 South-West Indian Ocean cyclone season

1974–75 South-West Indian Ocean cyclone season
Season summary map
First system formed 23 December 1974
Last system dissipated 22 April 1975
Strongest storm1 Gervaise – 951 hPa (mbar), 280 km/h (175 mph) (1-minute sustained)
Total depressions 10
Total storms 6
Tropical cyclones 5
Total fatalities 9 total
Total damage Unknown
1Strongest storm is determined by lowest pressure
South-West Indian Ocean tropical cyclone seasons
1972–73, 1973–74, 1974–75, 1975–76, 1976–77
Related articles

The 1974–75 South-West Indian Ocean cyclone season was a below-average cyclone season. The season officially ran from November 1, 1974, to April 30, 1975.


Storms

Tropical Disturbance Adele

Tropical disturbance (MFR)
Clockwise vortex
Duration December 23 – December 24
Peak intensity 45 km/h (30 mph) (10-min) 

Adele existed from December 23 to December 24.

Cyclone Blandine

Category 3 tropical cyclone (SSHWS)
Clockwise vortex
Duration January 6 – January 12
Peak intensity 185 km/h (115 mph) (1-min)  980 hPa (mbar)

Blandine existed from January 6 to January 12.

Cyclone Camille

Severe tropical storm (MFR)
Category 1 tropical cyclone (SSHWS)
Duration January 10 – January 21
Peak intensity 110 km/h (70 mph) (10-min)  995 hPa (mbar)

This system formed southeast of the Seychelles on January 7 before becoming disorganized while interacting with northern Madagascar. The system redeveloped as a hurricane-force cyclone in the northern Mozambique Channel on January 16 before moving southeast into Madagascar on January 19.[1]

Cyclone Robyn-Deborah

Tropical cyclone (MFR)
Category 3 tropical cyclone (SSHWS)
Duration January 14 – January 24
Peak intensity 130 km/h (80 mph) (10-min)  960 hPa (mbar)

This system existed from January 14 to January 24.

Tropical Depression Elsa

Tropical depression (MFR)
Clockwise vortex
Duration January 25 – January 27
Peak intensity 55 km/h (35 mph) (10-min) 

Elsa existed from January 25 to January 27.

Tropical Disturbance Fernande

Tropical disturbance (MFR)
Clockwise vortex
Duration February 1 – February 1
Peak intensity 45 km/h (30 mph) (10-min) 

This storm lasted for only 18 hours on February 1.

Cyclone Gervaise

Tropical cyclone (MFR)
Category 1 tropical cyclone (SSHWS)
Duration February 1 – February 10
Peak intensity 120 km/h (75 mph) (10-min)  951 hPa (mbar)

Intense tropical cyclone Gervaise formed on 1 February 1975 in the south of Diego Garcia. On the following day, the cyclone started to intensify gradually producing waves of 15 m high. The cyclone was moving in a west-south-west direction towards Madagascar when suddenly on 4 February 1975, the cyclone curved to a south-south-west direction, showing a potential danger to the Island of Mauritius. On 5 February 1975, the intense tropical cyclone Gervaise approached Mauritius where its eye was centered on the island on the morning of the 6th February 1975. Calm weather prevailed on the island from 09.30hr till 13hr30 and later the weather started to deteriorate again with average wind speeds over 200kmh for approx 12 hours either side of the eye and maximum gusts of 280 km/h until 2 o'clock in the morning of the 7th of February. It caused substantial damage to properties, vegetation and wildlife. Moored yachts around the coast were washed hundreds of yards inland in places due to the storm surge and in the capital Port Louis, a cargo ship of ca. 10,000 tonnes was washed up on to the quay. 6 deaths - 34 injured, 3,706 homeless.

Cyclone Heloise

Tropical depression (MFR)
Tropical depression (SSHWS)
Clockwise vortex
Duration February 19 – February 26
Peak intensity 55 km/h (35 mph) (10-min)  985 hPa (mbar)

Heloise existed from February 19 to February 26.

Cyclone Ines

Tropical storm (SSHWS)
Clockwise vortex
Duration March 9 – March 19
Peak intensity 100 km/h (65 mph) (1-min)  985 hPa (mbar)

Ines existed from March 9 to March 19.

Tropical Depression Junon

Tropical depression (MFR)
Clockwise vortex
Duration April 18 – April 22
Peak intensity 55 km/h (35 mph) (10-min) 

Junon existed from April 18 to April 22.

See also

References

  1. Dick DeAngelis. "Hurricane Alley". Mariners Weather Log 19 (3): 154.
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