Tropical Cyclone Irena
● 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.
Irena at 1978-02-07 14:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为Severe Tropical Storm, max wind 约 28.8 m/s (1 分钟平均) , minimum central pressure 976 hPa, at 1978-02-14 14:00:00前后结束, total 记录 29 track points (6 h一个) .
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1978-02-07 14:00 | -6.0°S, 49.0°E | Tropical Disturbance | 11.3 | - |
| 1978-02-08 02:00 | -7.2°S, 49.1°E | Tropical Cyclone | - | - |
| 1978-02-08 14:00 | -8.6°S, 49.0°E | Tropical Disturbance | 11.3 | - |
| 1978-02-09 02:00 | -9.0°S, 49.0°E | Tropical Cyclone | - | - |
| 1978-02-09 14:00 | -9.4°S, 48.9°E | Tropical Disturbance | 13.4 | 1000 |
| 1978-02-10 02:00 | -10.0°S, 48.7°E | Tropical Cyclone | - | - |
| 1978-02-10 14:00 | -10.4°S, 48.3°E | Moderate Tropical Storm | 20.1 | 991 |
| 1978-02-11 02:00 | -10.9°S, 47.7°E | Tropical Cyclone | - | - |
| 1978-02-11 14:00 | -11.3°S, 47.1°E | Severe Tropical Storm | 28.8 | 976 |
| 1978-02-12 02:00 | -13.0°S, 45.5°E | Tropical Cyclone | - | - |
| 1978-02-12 14:00 | -14.8°S, 43.6°E | Severe Tropical Storm | 28.8 | 976 |
| 1978-02-13 02:00 | -16.6°S, 42.4°E | Tropical Cyclone | - | - |
| 1978-02-13 14:00 | -18.9°S, 40.5°E | Tropical Disturbance | 15.4 | 997 |
| 1978-02-14 02:00 | -20.0°S, 38.0°E | Tropical Cyclone | - | - |
| 1978-02-14 14:00 | -20.9°S, 36.0°E | Tropical Cyclone | - | - |
Data sources: NOAA National Centers for Environmental Information IBTrACS v04r01 (Knapp et al., 2010), code 1978038S06049 / SH181978. There is no official Chinese name for this system, so the original English name is used. Intensity is classified by the regional agency for the basin and converted from 1-minute sustained wind using the WMO factor. For reference only. Data notes · Incorrect translation?
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