Tropical Cyclone Alison
● Data reliability: Generally reliable——Aircraft entered typhoons for in situ measurements, but satellites were not yet widespread: tracks are generally accurate, while intensities may be biased, with weaker cyclones potentially going unrecorded from 1950 until the advent of satellite coverage.
Alison at 1975-03-03 20:00:00 (BeijingTime) 在South Pacific首次被记录, peak intensity 为Category 3 tropical cyclone , max wind 约 46.8 m/s (1 分钟平均) , minimum central pressure 945 hPa, at 1975-03-13 20:00:00前后结束, total 记录 41 track points (6 h一个) . 曾Landfall或贴近land.
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1975-03-03 20:00 | -15.4°S, 168.2°E | Tropical Cyclone | - | - |
| 1975-03-04 08:00 | -15.9°S, 171.4°E | Category 1 Tropical Cyclone | 22.1 | 990 |
| 1975-03-04 20:00 | -16.6°S, 170.0°E | Category 2 Tropical Cyclone | 30.4 | 980 |
| 1975-03-05 08:00 | -17.0°S, 168.0°E | Category 3 tropical cyclone | 36 | 970 |
| 1975-03-05 20:00 | -17.1°S, 166.5°E | Category 3 tropical cyclone | 44.2 | 955 |
| 1975-03-06 08:00 | -17.6°S, 165.5°E | Category 3 tropical cyclone | 41.7 | 960 |
| 1975-03-06 20:00 | -18.4°S, 164.9°E | Category 3 tropical cyclone | 38.6 | 965 |
| 1975-03-07 08:00 | -19.5°S, 164.8°E | Category 3 tropical cyclone | 46.8 | 945 |
| 1975-03-07 20:00 | -21.4°S, 165.0°E | Category 3 tropical cyclone | 38.6 | 965 |
| 1975-03-08 08:00 | -23.5°S, 165.3°E | Category 3 tropical cyclone | 41.7 | 960 |
| 1975-03-08 20:00 | -25.6°S, 165.7°E | Category 3 tropical cyclone | 36 | 970 |
| 1975-03-09 08:00 | -27.6°S, 166.0°E | Category 2 Tropical Cyclone | 30.4 | 980 |
| 1975-03-09 20:00 | -29.6°S, 166.4°E | Category 2 Tropical Cyclone | 30.4 | 980 |
| 1975-03-10 08:00 | -31.4°S, 166.9°E | Category 2 Tropical Cyclone | 30.4 | 980 |
| 1975-03-10 20:00 | -34.2°S, 168.9°E | Category 2 Tropical Cyclone | 30.4 | 980 |
| 1975-03-11 08:00 | -35.1°S, 171.3°E | Category 2 Tropical Cyclone | 30.4 | 980 |
| 1975-03-11 20:00 | -36.4°S, 172.2°E | Category 2 Tropical Cyclone | 30.4 | 980 |
| 1975-03-12 08:00 | -38.1°S, 172.1°E | Category 2 Tropical Cyclone | 30.4 | 980 |
| 1975-03-12 20:00 | -40.5°S, 171.1°E | Category 2 Tropical Cyclone | 30.4 | 980 |
| 1975-03-13 08:00 | -42.1°S, 169.4°E | Tropical Cyclone | - | - |
| 1975-03-13 20:00 | -45.4°S, 167.0°E | Tropical Cyclone | - | - |
Data sources: NOAA National Environmental Information Center IBTrACS v04r01 (Knapp et al., 2010), code 1975063S15168 / SH231975. There is no official Chinese name for this system, so the original English name is used. Intensity is classified by the local agency in the relevant region, converted from 1-minute sustained winds using the WMO factor, for reference only. Data notes · Incorrect translation?
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