Tropical Cyclone Alexandra
● 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).
Alexandra at 1991-12-17 20:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为Severe Tropical Cyclone , max wind 约 54 m/s (1 分钟平均) , minimum central pressure 972 hPa, at 1991-12-29 08:00:00前后结束, total 记录 47 track points (6 h一个) .
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1991-12-17 20:00 | -7.5°S, 66.0°E | Tropical Disturbance | 10.3 | - |
| 1991-12-18 08:00 | -8.4°S, 67.8°E | Tropical Disturbance | 10.3 | 1005 |
| 1991-12-18 20:00 | -9.0°S, 70.0°E | Tropical Disturbance | 12.9 | 1002 |
| 1991-12-19 08:00 | -9.1°S, 72.1°E | Tropical Disturbance | 12.9 | 1000 |
| 1991-12-19 20:00 | -9.4°S, 74.0°E | Tropical Disturbance | 15.4 | 997 |
| 1991-12-20 08:00 | -10.8°S, 75.3°E | Tropical Depression | 18 | 991 |
| 1991-12-20 20:00 | -12.5°S, 76.2°E | Moderate Tropical Storm | 25.7 | 980 |
| 1991-12-21 08:00 | -14.4°S, 76.8°E | Tropical Cyclone | 38.6 | 972 |
| 1991-12-21 20:00 | -16.0°S, 77.5°E | Tropical Cyclone | 46.3 | 976 |
| 1991-12-22 08:00 | -16.6°S, 78.5°E | Severe Tropical Cyclone | 51.4 | 984 |
| 1991-12-22 20:00 | -16.6°S, 79.2°E | Severe Tropical Cyclone | 54 | 991 |
| 1991-12-23 08:00 | -16.9°S, 79.5°E | Tropical Cyclone | 48.9 | 991 |
| 1991-12-23 20:00 | -17.2°S, 79.1°E | Tropical Cyclone | 41.2 | 991 |
| 1991-12-24 08:00 | -17.2°S, 77.9°E | Severe Tropical Storm | 33.4 | 997 |
| 1991-12-24 20:00 | -17.3°S, 76.5°E | Moderate Tropical Storm | 25.7 | 1000 |
| 1991-12-25 08:00 | -17.5°S, 74.7°E | Moderate Tropical Storm | 20.6 | 1000 |
| 1991-12-25 20:00 | -18.2°S, 73.2°E | Tropical Disturbance | 15.4 | 1000 |
| 1991-12-26 08:00 | -18.8°S, 71.7°E | Tropical Disturbance | 12.9 | 1000 |
| 1991-12-26 20:00 | -19.2°S, 70.0°E | Tropical Disturbance | 11.3 | 1002 |
| 1991-12-27 08:00 | -19.8°S, 69.0°E | Tropical Disturbance | 11.3 | 1005 |
| 1991-12-27 20:00 | -21.0°S, 68.8°E | Tropical Disturbance | 11.3 | 1005 |
| 1991-12-28 08:00 | -21.8°S, 67.7°E | Tropical Disturbance | - | - |
| 1991-12-28 20:00 | -21.9°S, 66.8°E | Tropical Disturbance | - | - |
| 1991-12-29 08:00 | -21.8°S, 66.0°E | Tropical Disturbance | - | - |
Data source: NOAA National Environmental Information Center IBTrACS v04r01 (Knapp et al., 2010), code 1991352S08066 / SH091992. There is no official Chinese name for this storm; the English name is used. Intensity categories follow the classification of the local agency in the region, converted from 1-minute sustained winds using the WMO factor, for reference only. Data notes · Incorrect translation?
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