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 1991-10-16 20:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为Tropical Disturbance, max wind 约 15.4 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 25 track points (6 h一个) .
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1991-10-16 20:00 | -10.0°S, 76.5°E | Tropical Disturbance | 11.3 | 1005 |
| 1991-10-17 08:00 | -10.6°S, 75.2°E | Tropical Disturbance | 11.3 | 1005 |
| 1991-10-17 20:00 | -10.8°S, 74.3°E | Tropical Disturbance | 11.3 | 1005 |
| 1991-10-18 08:00 | -10.9°S, 73.6°E | Tropical Disturbance | 11.3 | 1005 |
| 1991-10-18 20:00 | -11.6°S, 74.1°E | Tropical Disturbance | 11.3 | 1002 |
| 1991-10-19 08:00 | -12.0°S, 74.5°E | Tropical Disturbance | 11.3 | 1002 |
| 1991-10-19 20:00 | -12.5°S, 74.7°E | Tropical Disturbance | 13.4 | 1000 |
| 1991-10-20 08:00 | -13.0°S, 74.2°E | Tropical Disturbance | 15.4 | 997 |
| 1991-10-20 20:00 | -13.4°S, 73.5°E | Tropical Disturbance | 15.4 | 997 |
| 1991-10-21 08:00 | -14.1°S, 69.2°E | Tropical Disturbance | 13.4 | 1000 |
| 1991-10-21 20:00 | -14.2°S, 66.3°E | Tropical Disturbance | 11.3 | 1002 |
| 1991-10-22 08:00 | -14.1°S, 64.2°E | Tropical Disturbance | 11.3 | 1005 |
| 1991-10-22 20:00 | -13.9°S, 62.3°E | Tropical Disturbance | - | - |
Data sources: NOAA National Environmental Information Center IBTrACS v04r01 (Knapp et al., 2010), code 1991290S10077. There is no official Chinese name for this system, so the original English name is used. Intensity categories follow the classification used by the local agency in the region (converted from 1-min sustained wind using the WMO factor), for reference only. Data notes · Incorrect translation?
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