Tropical Cyclone Alda
● 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).
Alda at 1999-01-14 20:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为Severe Tropical Storm, max wind 约 33.4 m/s (1 分钟平均) , minimum central pressure 975 hPa, at 1999-01-19 14:00:00前后结束, total 记录 20 track points (6 h一个) .
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1999-01-14 20:00 | -20.2°S, 36.1°E | Tropical Disturbance | 8.2 | 1002 |
| 1999-01-15 02:00 | -20.4°S, 36.4°E | Tropical Disturbance | 8.2 | 1002 |
| 1999-01-15 08:00 | -20.3°S, 36.2°E | Tropical Disturbance | 8.2 | 1002 |
| 1999-01-15 14:00 | -20.2°S, 36.2°E | Tropical Disturbance | 11.3 | 1000 |
| 1999-01-15 20:00 | -20.0°S, 37.7°E | Tropical Disturbance | 10.3 | 998 |
| 1999-01-16 02:00 | -20.3°S, 38.8°E | Tropical Disturbance | 12.9 | 998 |
| 1999-01-16 08:00 | -20.5°S, 39.6°E | Tropical Disturbance | 15.4 | 998 |
| 1999-01-16 14:00 | -21.0°S, 40.2°E | Tropical Disturbance | 15.4 | 997 |
| 1999-01-16 20:00 | -21.7°S, 40.2°E | Tropical Disturbance | 15.4 | 994 |
| 1999-01-17 02:00 | -22.5°S, 40.1°E | Tropical Depression | 18 | 990 |
| 1999-01-17 08:00 | -23.3°S, 39.5°E | Tropical Depression | 18 | 988 |
| 1999-01-17 14:00 | -23.9°S, 39.1°E | Tropical Depression | 18 | 985 |
| 1999-01-17 20:00 | -24.6°S, 38.7°E | Moderate Tropical Storm | 20.6 | 985 |
| 1999-01-18 02:00 | -25.3°S, 38.7°E | Moderate Tropical Storm | 23.1 | 985 |
| 1999-01-18 08:00 | -26.4°S, 38.8°E | Severe Tropical Storm | 28.3 | 980 |
| 1999-01-18 14:00 | -27.5°S, 39.1°E | Severe Tropical Storm | 33.4 | 978 |
| 1999-01-18 20:00 | -28.6°S, 39.8°E | Severe Tropical Storm | 28.3 | 975 |
| 1999-01-19 02:00 | -29.7°S, 41.0°E | Severe Tropical Storm | 28.3 | 975 |
| 1999-01-19 08:00 | -30.9°S, 42.8°E | Severe Tropical Storm | 28.3 | 978 |
| 1999-01-19 14:00 | -32.3°S, 45.0°E | Extratropical cyclone | 23.1 | 985 |
Data source: NOAA National Environmental Information Center IBTrACS v04r01 (Knapp et al., 2010), code 1999015S20036 / SH121999. There is no official Chinese name for this system, so the original English name is used. Intensity is classified by the local agency for the region, converted from 1-minute sustained wind using the WMO factor, and is for reference only. Data notes · Incorrect translation?
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