Unnamed 1999 South Indian Ocean Tropical Cyclone
● 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 1999-02-11 20:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为Moderate Tropical Storm, max wind 约 23.1 m/s (1 分钟平均) , minimum central pressure 994 hPa, at 1999-02-17 08:00:00前后结束, total 记录 23 track points (6 h一个) .
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1999-02-11 20:00 | -18.4°S, 38.4°E | Tropical Cyclone | - | - |
| 1999-02-12 02:00 | -18.5°S, 39.4°E | Tropical Disturbance | 12.9 | 1002 |
| 1999-02-12 08:00 | -18.5°S, 39.5°E | Tropical Disturbance | 11.3 | 1004 |
| 1999-02-12 14:00 | -18.7°S, 39.7°E | Tropical Disturbance | 11.3 | 1005 |
| 1999-02-12 20:00 | -19.4°S, 39.3°E | Tropical Disturbance | 10.3 | 1003 |
| 1999-02-13 02:00 | -20.2°S, 38.6°E | Tropical Disturbance | 12.9 | 1000 |
| 1999-02-13 08:00 | -20.9°S, 38.3°E | Tropical Disturbance | 15.4 | 1000 |
| 1999-02-13 14:00 | -21.6°S, 38.0°E | Tropical Disturbance | 15.4 | 998 |
| 1999-02-13 20:00 | -22.2°S, 37.8°E | Tropical Depression | 18 | 996 |
| 1999-02-14 02:00 | -22.7°S, 38.0°E | Moderate Tropical Storm | 20.6 | 995 |
| 1999-02-14 08:00 | -22.9°S, 38.6°E | Moderate Tropical Storm | 20.6 | 994 |
| 1999-02-14 14:00 | -22.9°S, 39.2°E | Moderate Tropical Storm | 23.1 | 994 |
| 1999-02-14 20:00 | -22.7°S, 39.9°E | Moderate Tropical Storm | 20.6 | 994 |
| 1999-02-15 02:00 | -21.9°S, 40.6°E | Tropical Depression | 18 | 995 |
| 1999-02-15 08:00 | -20.6°S, 40.8°E | Tropical Depression | 18 | 996 |
| 1999-02-15 14:00 | -19.8°S, 40.7°E | Tropical Disturbance | 15.4 | 998 |
| 1999-02-15 20:00 | -19.3°S, 40.3°E | Tropical Disturbance | 15.4 | 1000 |
| 1999-02-16 02:00 | -18.7°S, 40.0°E | Tropical Disturbance | 15.4 | 1000 |
| 1999-02-16 08:00 | -18.3°S, 39.5°E | Tropical Disturbance | 15.4 | 1002 |
| 1999-02-16 14:00 | -18.4°S, 39.1°E | Tropical Disturbance | 12.9 | 1004 |
| 1999-02-16 20:00 | -18.6°S, 38.7°E | Tropical Disturbance | 12.9 | 1005 |
| 1999-02-17 02:00 | -18.8°S, 38.1°E | Tropical Disturbance | 12.9 | 1005 |
| 1999-02-17 08:00 | -19.2°S, 37.5°E | Tropical Disturbance | 8.2 | 1006 |
Data sources: NOAA National Environmental Information Center IBTrACS v04r01 (Knapp et al., 2010), code 1999043S18038 / SH211999. There is no official Chinese name for this system, so the original English name is used. Intensity grades follow the classification of the local agency in the region, converted from 1-minute sustained wind using the WMO factor, and are for reference only. Data notes · Incorrect translation?
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