Tropical Cyclone Marcia
● 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.
Marcia at 1974-10-17 08:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为Category 2 Tropical Cyclone , max wind 约 27.8 m/s (1 分钟平均) , minimum central pressure 988 hPa, at 1974-10-25 08:00:00前后结束, total 记录 33 track points (6 h一个) .
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1974-10-17 08:00 | -8.8°S, 88.8°E | Tropical Disturbance | 11.3 | 1006 |
| 1974-10-17 20:00 | -8.8°S, 89.3°E | Tropical Disturbance | 11.3 | 1005 |
| 1974-10-18 08:00 | -8.9°S, 89.8°E | Tropical Disturbance | 13.9 | 1003 |
| 1974-10-18 20:00 | -9.6°S, 90.9°E | Category 1 Tropical Cyclone | 19.5 | 998 |
| 1974-10-19 08:00 | -10.4°S, 91.9°E | Category 1 Tropical Cyclone | 22.1 | 994 |
| 1974-10-19 20:00 | -10.9°S, 92.5°E | Category 1 Tropical Cyclone | 24.7 | 991 |
| 1974-10-20 08:00 | -11.5°S, 93.0°E | Category 2 Tropical Cyclone | 27.8 | 988 |
| 1974-10-20 20:00 | -12.0°S, 93.5°E | Category 1 Tropical Cyclone | 24.7 | 992 |
| 1974-10-21 08:00 | -12.6°S, 93.8°E | Tropical Depression | 16.5 | 999 |
| 1974-10-21 20:00 | -13.7°S, 94.7°E | Tropical Depression | 16.5 | 1000 |
| 1974-10-22 08:00 | -15.2°S, 95.5°E | Tropical Depression | 13.9 | 1002 |
| 1974-10-22 20:00 | -15.8°S, 94.4°E | Tropical Depression | 13.9 | 1002 |
| 1974-10-23 08:00 | -16.0°S, 92.7°E | Tropical Depression | 13.9 | 1004 |
| 1974-10-23 20:00 | -16.3°S, 91.2°E | Tropical Depression | 11.3 | 1005 |
| 1974-10-24 08:00 | -16.8°S, 89.4°E | Tropical Disturbance | 11.3 | 1008 |
| 1974-10-24 20:00 | -17.0°S, 87.7°E | Tropical Disturbance | 11.3 | 1009 |
| 1974-10-25 08:00 | -17.0°S, 86.0°E | Tropical Disturbance | 11.3 | 1010 |
Data sources: NOAA National Centers for Environmental Information IBTrACS v04r01 (Knapp et al., 2010), code 1974290S09089. There is no official Chinese name for this storm, so the English name is shown. Intensity categories follow the classifications of the local agency in the relevant basin, converted from 1-minute sustained winds using WMO factors, and are for reference only. Data notes · Incorrect translation?
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