Tropical Cyclone 翠W (Tracy)
● 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.
翠W (Tracy) at 1974-12-20 08:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为4级Tropical Cyclone , max wind 约 52.5 m/s (1 分钟平均) , minimum central pressure 950 hPa, at 1974-12-26 08:00:00前后结束, total 记录 25 track points (6 h一个) . 曾Landfall或贴近land.
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1974-12-20 08:00 | -8.1°S, 135.0°E | Tropical Depression | 13.9 | 1000 |
| 1974-12-20 20:00 | -8.6°S, 134.0°E | Tropical Depression | 13.9 | 998 |
| 1974-12-21 08:00 | -9.0°S, 133.0°E | Category 1 Tropical Cyclone | 19.5 | 992 |
| 1974-12-21 20:00 | -9.3°S, 132.0°E | Tropical Depression | 5.1 | - |
| 1974-12-22 08:00 | -10.0°S, 131.1°E | Tropical Depression | 15.4 | - |
| 1974-12-22 20:00 | -10.7°S, 130.6°E | Tropical Depression | 12.9 | - |
| 1974-12-23 08:00 | -11.2°S, 130.3°E | Tropical Depression | 18 | - |
| 1974-12-23 20:00 | -11.6°S, 130.0°E | Tropical Depression | 15.4 | - |
| 1974-12-24 08:00 | -11.9°S, 129.9°E | Category 2 Tropical Cyclone | 33.4 | - |
| 1974-12-24 20:00 | -12.2°S, 130.5°E | Tropical Depression | 15.4 | - |
| 1974-12-25 08:00 | -12.5°S, 131.4°E | Tropical Cyclone | - | - |
| 1974-12-25 20:00 | -13.2°S, 132.7°E | Tropical Depression | 16.5 | 996 |
| 1974-12-26 08:00 | -14.0°S, 134.1°E | Tropical Depression | 13.9 | 998 |
Data sources: NOAA National Centers for Environmental Information IBTrACS v04r01 (Knapp et al., 2010), code 1974354S08135 / SH071975. Chinese name source: Wikidata Q245544. Intensity categories follow the classifications of local agencies in the region, converted from 1-minute sustained winds using the WMO factor, for reference only. Data notes · Incorrect translation?
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