The 1969–70 South-West Indian Ocean cyclone season was an active cyclone season.
| 1969–70 South-West Indian Ocean cyclone season | |
|---|---|
 Season summary map | |
| Seasonal boundaries | |
| First system formed | August 19, 1969 |
| Last system dissipated | April 1, 1970 |
| Strongest storm | |
| Name | Jane |
| • Maximum winds | 230 km/h (145 mph) (1-minute sustained) |
| Seasonal statistics | |
| Total depressions | 13 |
| Total storms | 13 |
| Tropical cyclones | 6 |
| Intense tropical cyclones | 0 |
| Very intense tropical cyclones | 2 |
| Total fatalities | 30 |
| Total damage | Unknown |
| Related articles | |
Systems edit
Severe Tropical Storm Aline edit
| Severe tropical storm (MFR) | |
  | |
| Duration | August 19 – August 22 |
|---|---|
| Peak intensity | 100 km/h (65 mph) (10-min); |
Aline existed from August 19 to August 22.
Tropical Cyclone Blanche edit
| Tropical cyclone (MFR) | |
  | |
| Duration | October 7 – October 15 |
|---|---|
| Peak intensity | 130 km/h (80 mph) (10-min); |
October 7 to October 15.
Moderate Tropical Storm Corrine edit
| Moderate tropical storm (MFR) | |
  | |
| Duration | November 11 – November 21 |
|---|---|
| Peak intensity | 85 km/h (50 mph) (10-min); |
26 deaths in Comoros and Mozambique.[1]
Moderate Tropical Storm Delphine edit
| Moderate tropical storm (MFR) | |
  | |
| Duration | December 29 – January 1 |
|---|---|
| Peak intensity | 65 km/h (40 mph) (10-min); |
Delphine existed from December 29 to January 1.
Tropical Cyclone Diane–Francoise edit
| Tropical cyclone (MFR) | |
  | |
| Duration | January 10 (entered basin) – January 16 |
|---|---|
| Peak intensity | 130 km/h (80 mph) (10-min); |
This system entered the basin on January 7 and dissipated on January 17.
Moderate Tropical Storm Eliane edit
| Moderate tropical storm (MFR) | |
  | |
| Duration | January 7 – January 11 |
|---|---|
| Peak intensity | 65 km/h (40 mph) (10-min); |
The storm struck western Madagascar, bringing rainfall.[2]
Tropical Cyclone Genevieve edit
| Tropical cyclone (MFR) | |
  | |
| Duration | January 10 – January 19 |
|---|---|
| Peak intensity | 120 km/h (75 mph) (10-min); |
Four deaths in Madagascar due to flooding.[3]
Tropical Cyclone Hermine edit
| Tropical cyclone (MFR) | |
  | |
| Duration | January 22 – January 27 |
|---|---|
| Peak intensity | 120 km/h (75 mph) (10-min); |
One death on Reunion.[4]
Very Intense Tropical Cyclone Harriet-Iseult edit
| Very intense tropical cyclone (MFR) | |
  | |
| Duration | February 3 (entered basin) – February 13 |
|---|---|
| Peak intensity | 220 km/h (140 mph) (10-min); |
Iseult existed from February 2 to February 15.
Very Intense Tropical Cyclone Josephine-Jane edit
| Very intense tropical cyclone (MFR) | |
  | |
| Duration | February 11 (entered basin) – February 28 |
|---|---|
| Peak intensity | 230 km/h (145 mph) (10-min); |
It was named Josephine in its formative stages due to being in what was considered the Australian basin at the time.[5]
Moderate Tropical Storm Katia edit
| Moderate tropical storm (MFR) | |
  | |
| Duration | March 16 – March 26 |
|---|---|
| Peak intensity | 85 km/h (50 mph) (10-min); |
Katia existed from March 16 to March 26.
Tropical Cyclone Louise edit
| Tropical cyclone (MFR) | |
  | |
| Duration | March 20 – April 1 |
|---|---|
| Peak intensity | 155 km/h (100 mph) (10-min); |
Louise existed from March 20 to April 1.
Tropical Cyclone Kathy–Michelle edit
| Tropical cyclone (MFR) | |
  | |
| Duration | March 26 (entered basin) – March 30 |
|---|---|
| Peak intensity | 140 km/h (85 mph) (10-min); |
Michelle entered the basin on March 24 and dissipated on March 30.
