Unnamed Tropical Cyclone in the South Indian Ocean in 1991
● Data reliability: ReliableWeather satellites monitored it throughout, so its track and intensity are relatively accurate (Atlantic and E. Pacific since 1966, other basins since 1980).
未命名 at 1991-10-11 20:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为Tropical Depression, max wind 约 18 m/s (1 分钟平均) , minimum central pressure 997 hPa, at 1991-10-22 20:00:00前后结束, total 记录 45 track points (6 h一个) .
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1991-10-11 20:00 | -7.6°S, 63.6°E | Tropical Disturbance | 7.7 | - |
| 1991-10-12 08:00 | -7.6°S, 63.2°E | Tropical Disturbance | 7.7 | - |
| 1991-10-12 20:00 | -7.7°S, 62.7°E | Tropical Disturbance | 10.3 | - |
| 1991-10-13 08:00 | -7.8°S, 62.3°E | Tropical Disturbance | 10.3 | - |
| 1991-10-13 20:00 | -8.1°S, 61.7°E | Tropical Disturbance | 10.3 | - |
| 1991-10-14 08:00 | -8.6°S, 61.0°E | Tropical Disturbance | 12.9 | - |
| 1991-10-14 20:00 | -9.0°S, 60.0°E | Tropical Disturbance | 12.9 | 1005 |
| 1991-10-15 08:00 | -9.4°S, 59.1°E | Tropical Disturbance | 12.9 | 1005 |
| 1991-10-15 20:00 | -10.0°S, 58.1°E | Tropical Disturbance | 12.9 | 1002 |
| 1991-10-16 08:00 | -10.7°S, 57.2°E | Tropical Disturbance | 12.9 | 1000 |
| 1991-10-16 20:00 | -11.3°S, 55.9°E | Tropical Disturbance | 15.4 | 1000 |
| 1991-10-17 08:00 | -11.3°S, 54.5°E | Tropical Disturbance | 15.4 | 997 |
| 1991-10-17 20:00 | -11.3°S, 53.4°E | Tropical Disturbance | 15.4 | 997 |
| 1991-10-18 08:00 | -11.1°S, 52.4°E | Tropical Depression | 18 | 997 |
| 1991-10-18 20:00 | -10.8°S, 51.4°E | Tropical Depression | 18 | 997 |
| 1991-10-19 08:00 | -10.8°S, 50.6°E | Tropical Depression | 18 | 997 |
| 1991-10-19 20:00 | -10.9°S, 49.9°E | Tropical Depression | 18 | 1000 |
| 1991-10-20 08:00 | -10.4°S, 49.4°E | Tropical Disturbance | 15.4 | 1000 |
| 1991-10-20 20:00 | -9.8°S, 49.0°E | Tropical Disturbance | 15.4 | 1000 |
| 1991-10-21 08:00 | -9.5°S, 48.7°E | Tropical Disturbance | 12.9 | 1005 |
| 1991-10-21 20:00 | -9.4°S, 47.7°E | Tropical Disturbance | 11.3 | 1005 |
| 1991-10-22 08:00 | -8.7°S, 46.8°E | Tropical Disturbance | - | - |
| 1991-10-22 20:00 | -8.0°S, 45.3°E | Tropical Disturbance | - | - |
Data sources: NOAA National Centers for Environmental Information IBTrACS v04r01 (Knapp et al., 2010), code 1991285S08064 / SH021992. There is no official Chinese name for this system, so the original English name is used. Intensity is classified by the local agency in the relevant sea area, converted from 1-minute sustained wind using WMO factors, for reference only. Data notes · Incorrect translation?
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