Tropical Cyclone Alison
● 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).
Alison at 1991-01-08 08:00:00 (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 1002 hPa, at 1991-01-18 20:00:00前后结束, total 记录 43 track points (6 h一个) .
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1991-01-08 08:00 | -8.8°S, 78.4°E | Tropical Disturbance | 11.3 | 1002 |
| 1991-01-08 20:00 | -8.8°S, 79.4°E | Tropical Disturbance | 11.3 | 1002 |
| 1991-01-09 08:00 | -8.9°S, 80.3°E | Tropical Cyclone | - | - |
| 1991-01-09 20:00 | -8.7°S, 81.1°E | Tropical Disturbance | 7.7 | - |
| 1991-01-10 08:00 | -8.7°S, 81.8°E | Tropical Disturbance | 7.7 | - |
| 1991-01-10 20:00 | -8.5°S, 82.4°E | Tropical Disturbance | 7.7 | - |
| 1991-01-11 08:00 | -8.5°S, 82.6°E | Tropical Disturbance | 10.3 | - |
| 1991-01-11 20:00 | -9.0°S, 83.1°E | Tropical Disturbance | 10.3 | - |
| 1991-01-12 08:00 | -9.9°S, 83.1°E | Tropical Disturbance | 10.3 | - |
| 1991-01-12 20:00 | -10.7°S, 82.8°E | Tropical Disturbance | 12.9 | - |
| 1991-01-13 08:00 | -11.3°S, 82.0°E | Tropical Disturbance | 15.4 | - |
| 1991-01-13 20:00 | -11.5°S, 81.4°E | Tropical Disturbance | 15.4 | - |
| 1991-01-14 08:00 | -11.8°S, 81.1°E | Moderate Tropical Storm | 23.1 | - |
| 1991-01-14 20:00 | -12.5°S, 80.9°E | Moderate Tropical Storm | 23.1 | - |
| 1991-01-15 08:00 | -13.4°S, 81.1°E | Severe Tropical Storm | 33.4 | - |
| 1991-01-15 20:00 | -15.2°S, 81.6°E | Severe Tropical Storm | 33.4 | - |
| 1991-01-16 08:00 | -17.2°S, 82.1°E | Severe Tropical Storm | 33.4 | - |
| 1991-01-16 20:00 | -19.6°S, 82.4°E | Severe Tropical Storm | 30.9 | - |
| 1991-01-17 08:00 | -22.0°S, 82.3°E | Moderate Tropical Storm | 25.7 | - |
| 1991-01-17 20:00 | -24.3°S, 82.3°E | Moderate Tropical Storm | 20.6 | - |
| 1991-01-18 08:00 | -26.5°S, 84.0°E | Tropical Disturbance | 15.4 | - |
| 1991-01-18 20:00 | -27.9°S, 87.0°E | Tropical Disturbance | - | - |
Data sources: NOAA National Centers for Environmental Information IBTrACS v04r01 (Knapp et al., 2010); code 1991008S09078 / SH071991. 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, based on 1-minute sustained wind converted using the WMO factor, for reference only. Data notes · Incorrect translation?
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