1970–71 South-West Indian Ocean cyclone season explained
| Basin: | SWI |
| Year: | 1971 |
| Track: | 1970-1971 South-West Indian Ocean cyclone season summary.jpg |
| First Storm Formed: | 16 September 1970 |
| Last Storm Dissipated: | 21 March 1971 |
| Strongest Storm Name: | Maggie-Muriel |
| Strongest Storm Pressure: | 951 |
| Strongest Storm Winds: | 105 |
| Average Wind Speed: | 10 |
| Total Disturbances: | 16 |
| Total Depressions: | 15 |
| Total Storms: | 15 |
| Total Hurricanes: | 10 |
| Total Intense: | 4 |
| Total Super: | 0 |
| Fatalities: | 32 |
| Australian Season: | 1970–71 Australian region cyclone season |
| South Pacific Season: | 1970–71 South Pacific cyclone season |
The 1970–71 South-West Indian Ocean cyclone season was an above-average cyclone season. The season officially ran from November 1, 1970, to April 30, 1971.
Systems
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Tropical Disturbance Andree
| Basin: | SWI |
| Track: | Andree 1970 track.png |
| Formed: | September 16 |
| Dissipated: | September 19 |
| 10-Min Winds: | 25 |
| 1-Min Winds: | 30 |
Moderate Tropical Storm Betsy
| Basin: | SWI |
| Track: | Betsy 1970 track.png |
| Formed: | October 1 |
| Dissipated: | October 8 |
| 10-Min Winds: | 35 |
| 1-Min Winds: | 35 |
Moderate Tropical Storm Andrea–Claudine
| Basin: | SWI |
| Track: | Andrea-Claudine 1970 track.png |
| Formed: | November 10 (Crossed 80°E) |
| Dissipated: | November 13 |
| Pressure: | 970 |
| 10-Min Winds: | 35 |
| 1-Min Winds: | 35 |
- Andrea-Claudine, 10 November to 13 November 1970 in central Indian Ocean
Intense Tropical Cyclone Hilary–Dominique
| Basin: | SWI |
| Track: | Hilary-Dominique 1970 track.png |
| Formed: | December 12 |
| Dissipated: | December 28 |
| 10-Min Winds: | 90 |
| 1-Min Winds: | 100 |
- Hilary, 11 to 18 December 1970 in central Indian Ocean
Moderate Tropical Storm Edith
| Basin: | SWI |
| Track: | SWI Edith 1971 track.png |
| Formed: | January 5 |
| Dissipated: | January 10 |
| 10-Min Winds: | 35 |
| 1-Min Winds: | 35 |
Tropical Cyclone Felicie
| Basin: | SWI |
| Track: | Felicie 1971 track.png |
| Formed: | January 17 |
| Dissipated: | February 6 |
| 10-Min Winds: | 65 |
| 1-Min Winds: | 75 |
Cyclone Felicie was a slow moving cyclone that made a large number of landfalls in Madagascar, 4, in addition to a single landfall in Mozambique, which reportedly killed 30 people. The storm followed a very erratic track due to unusual steering patterns, and went through many cycles of strengthening and weakening as it slowly trudged to the south. Felicie reached Tropical Cyclone status three separate times, before finally becoming extratropical southwest of Madagascar.[1]
Tropical Cyclone Myrtle–Ginette
| Basin: | SWI |
| Track: | Myrtle-Ginette 1971 track.png |
| Formed: | January 15 |
| Dissipated: | January 31 |
| 10-Min Winds: | 80 |
| 1-Min Winds: | 90 |
On January 19, Severe Tropical Cyclone Myrtle entered the South-West Indian Ocean; therefore, it was assigned a second name, Ginette. The next day, Ginette reached hurricane status and developed a clear eye as it traveled generally west-southwestward. On January 22, Ginette curved southwestward and came within 72abbr=offNaNabbr=off of the island of Rodrigues. On Rodrigues, winds as high as 150km/h were recorded along with a minimum barometric pressure of 989mbar. Throughout the next two days, Ginette approached the island of Reunion, causing stormy weather that lasted until January 29. In Reunion, swells associated with Ginette reached 6abbr=offNaNabbr=off at times. On January 25, Ginette became stationary while located south of Reunion. The next day, Ginette encountered a ridge which caused it to execute a small clockwise loop. After completing the loop, Ginette accelerated southeastward and gradually weakened. By January 31, Ginette had transitioned into an extratropical cyclone.[2]
Tropical Cyclone Helga
| Basin: | SWI |
| Track: | Helga 1971 track.png |
| Formed: | February 2 |
| Dissipated: | February 15 |
| 10-Min Winds: | 80 |
| 1-Min Winds: | 90 |
On February 8, Helga passed southeast of Réunion and Mauritius, bringing heavy rainfall to the former island, reaching 926mm at Commerson. Two people died on the island due to drowning.[3]
Tropical Cyclone Tilly-Iphigenie
| Basin: | SWI |
| Track: | Tilly-Iphigenie 1971 track.png |
| Formed: | February 14 (entered basin) |
| Dissipated: | February 17 |
| Pressure: | 970 |
| 10-Min Winds: | 65 |
| 1-Min Winds: | 65 |
Tropical Cyclone Joelle
| Basin: | SWI |
| Track: | Joelle 1971 track.png |
| Formed: | February 15 |
| Dissipated: | February 25 |
| 10-Min Winds: | 65 |
| 1-Min Winds: | 65 |
Tropical Cyclone Kalinka
| Basin: | SWI |
| Track: | Kalinka 1971 track.png |
| Formed: | February 16 |
| Dissipated: | February 26 |
| 10-Min Winds: | 75 |
| 1-Min Winds: | 85 |
Tropical Cyclone Yvonne–Lise
| Basin: | SWI |
| Track: | Yvonne-Lise 1971 track.png |
| Formed: | February 21 |
| Dissipated: | March 3 |
| 10-Min Winds: | 70 |
| 1-Min Winds: | 80 |
Intense Tropical Cyclone Maggie–Muriel
| Basin: | SWI |
| Track: | Maggie-Muriel 1971 track.png |
| Formed: | March 7 |
| Dissipated: | March 18 |
| Pressure: | 951 |
| 10-Min Winds: | 90 |
| 1-Min Winds: | 100 |
- Maggie/Muriel, 7 to 20 March 1971 in central Indian Ocean
Tropical Cyclone Nelly
| Basin: | SWI |
| Track: | Nelly 1971 track.png |
| Formed: | March 12 |
| Dissipated: | March 22 |
| 10-Min Winds: | 65 |
| 1-Min Winds: | 75 |
See also
- Atlantic hurricane seasons: 1970, 1971
- Eastern Pacific hurricane seasons: 1970, 1971
- Western Pacific typhoon seasons: 1970, 1971
- North Indian Ocean cyclone seasons: 1970, 1971
Notes and References
- Global tropical/extratropical cyclone climatic atlas. [{{GTECCA url|basin=SWI|year=1971_2}} Tropical Storm Felice, 17 January- 5 February]. 1996. National Climatic Data Center. February 11, 2019.
- [{{GTECCA url|basin=SWI|year=1971_1}} Hurricane Ginette, 17–31 January]. February 12, 2019. Global tropical/extratropical cyclone climatic atlas. 1996. National Climatic Data Center.
- Global tropical/extratropical cyclone climatic atlas. [{{GTECCA url|basin=SWI|year=1971_4}} Hurricane Helga, 3–12 February]. 1996. National Climatic Data Center. February 11, 2019.
