Tropical Cyclone Joan
● 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.
Joan at 1975-11-30 08:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为Category 5 Tropical Cyclone , max wind 约 64.3 m/s (1 分钟平均) , at 1975-12-10 08:00:00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 |
|---|
| 1975-11-30 08:00 | -11.0°S, 128.4°E | Tropical Depression | 10.3 | - |
| 1975-11-30 20:00 | -11.3°S, 128.3°E | Tropical Depression | 15.4 | - |
| 1975-12-01 08:00 | -11.6°S, 128.2°E | Category 1 Tropical Cyclone | 20.6 | - |
| 1975-12-01 20:00 | -12.1°S, 128.0°E | Category 1 Tropical Cyclone | 23.1 | - |
| 1975-12-02 08:00 | -12.5°S, 127.8°E | Category 1 Tropical Cyclone | 25.7 | - |
| 1975-12-02 20:00 | -13.0°S, 127.4°E | Category 2 Tropical Cyclone | 30.9 | - |
| 1975-12-03 08:00 | -13.5°S, 126.7°E | Category 3 tropical cyclone | 36 | - |
| 1975-12-03 20:00 | -13.7°S, 125.9°E | Category 3 tropical cyclone | 41.2 | - |
| 1975-12-04 08:00 | -14.3°S, 123.9°E | Category 3 tropical cyclone | 46.3 | - |
| 1975-12-04 20:00 | -14.8°S, 122.7°E | Category 4 tropical cyclone | 48.9 | - |
| 1975-12-05 08:00 | -15.9°S, 121.3°E | Category 4 tropical cyclone | 51.4 | - |
| 1975-12-05 20:00 | -16.2°S, 120.1°E | Category 4 tropical cyclone | 54 | - |
| 1975-12-06 08:00 | -16.4°S, 118.9°E | Category 4 tropical cyclone | 56.6 | - |
| 1975-12-06 20:00 | -16.6°S, 118.1°E | Category 5 Tropical Cyclone | 61.7 | - |
| 1975-12-07 08:00 | -17.5°S, 117.9°E | Category 5 Tropical Cyclone | 64.3 | - |
| 1975-12-07 20:00 | -19.0°S, 118.0°E | Category 5 Tropical Cyclone | 64.3 | - |
| 1975-12-08 08:00 | -20.6°S, 118.1°E | Category 4 tropical cyclone | 56.6 | - |
| 1975-12-08 20:00 | -21.9°S, 117.7°E | Category 3 tropical cyclone | 41.2 | - |
| 1975-12-09 08:00 | -23.3°S, 117.2°E | Category 1 Tropical Cyclone | 25.7 | - |
| 1975-12-09 20:00 | -24.7°S, 116.9°E | Tropical Depression | 18 | - |
| 1975-12-10 08:00 | -26.6°S, 117.0°E | Category 1 Tropical Cyclone | 23.1 | - |
Data sources: NOAA National Centers for Environmental Information IBTrACS v04r01 (Knapp et al., 2010), code 1975334S11128 / SH041976. This area has no official Chinese translated name, so the original English name is used. Intensity categories follow the local agency classification for the region, converted from 1-minute sustained winds using WMO coefficients. For reference only. Data notes · Incorrect translation?
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