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 1999-03-12 02:00:00 (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 995 hPa, at 1999-03-21 08:00:00前后结束, total 记录 38 track points (6 h一个) .
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1999-03-12 02:00 | -14.7°S, 86.9°E | Tropical Disturbance | 11.3 | 1003 |
| 1999-03-12 14:00 | -14.4°S, 85.0°E | Tropical Disturbance | 11.3 | 1002 |
| 1999-03-13 02:00 | -13.4°S, 83.1°E | Tropical Disturbance | 11.3 | 1002 |
| 1999-03-13 14:00 | -12.7°S, 81.1°E | Tropical Disturbance | 11.3 | 1001 |
| 1999-03-14 02:00 | -12.7°S, 78.9°E | Tropical Disturbance | 12.9 | 1000 |
| 1999-03-14 14:00 | -12.5°S, 77.5°E | Tropical Disturbance | 13.9 | 999 |
| 1999-03-15 02:00 | -12.0°S, 76.6°E | Tropical Disturbance | 12.9 | 1000 |
| 1999-03-15 14:00 | -12.2°S, 75.9°E | Tropical Disturbance | 13.9 | 999 |
| 1999-03-16 02:00 | -12.5°S, 74.9°E | Tropical Disturbance | 12.9 | 999 |
| 1999-03-16 14:00 | -12.9°S, 74.3°E | Tropical Disturbance | 12.9 | 996 |
| 1999-03-17 02:00 | -13.3°S, 74.0°E | Tropical Disturbance | 15.4 | 996 |
| 1999-03-17 14:00 | -13.6°S, 73.7°E | Tropical Depression | 18 | 995 |
| 1999-03-18 02:00 | -13.9°S, 73.2°E | Tropical Depression | 18 | 995 |
| 1999-03-18 14:00 | -14.5°S, 73.2°E | Tropical Disturbance | 15.4 | 996 |
| 1999-03-19 02:00 | -15.2°S, 73.5°E | Tropical Disturbance | 15.4 | 999 |
| 1999-03-19 14:00 | -15.8°S, 73.0°E | Tropical Disturbance | 15.4 | 999 |
| 1999-03-20 02:00 | -17.3°S, 71.4°E | Tropical Disturbance | 13.9 | 999 |
| 1999-03-20 14:00 | -18.3°S, 70.3°E | Tropical Disturbance | 11.3 | 1002 |
| 1999-03-21 02:00 | -19.2°S, 70.1°E | Tropical Cyclone | - | 1003 |
| 1999-03-21 08:00 | -19.9°S, 70.2°E | Tropical Cyclone | - | 1004 |
Data sources: NOAA National Centers for Environmental Information IBTrACS v04r01 (Knapp et al., 2010); code 1999071S15087 / SH291999. This basin has no official Chinese name, so the original English name is used. Intensity categories follow the classifications of the relevant local agency in the basin, converted from 1-minute sustained wind using the WMO factor, and are provided for reference only. Data notes · Incorrect translation?
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