Tropical Cyclone Irene
● 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.
Irene at 1977-01-06 08:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为Category 3 tropical cyclone , max wind 约 43.7 m/s (1 分钟平均) , minimum central pressure 970 hPa, at 1977-01-13 08:00:00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 |
|---|
| 1977-01-06 08:00 | -11.2°S, 121.0°E | Tropical Depression | 12.9 | 1000 |
| 1977-01-06 20:00 | -11.5°S, 121.1°E | Tropical Depression | 18 | 995 |
| 1977-01-07 08:00 | -11.8°S, 121.4°E | Category 1 Tropical Cyclone | 25.7 | 990 |
| 1977-01-07 20:00 | -12.1°S, 121.8°E | Category 2 Tropical Cyclone | 30.9 | 984 |
| 1977-01-08 08:00 | -12.9°S, 123.9°E | Category 3 tropical cyclone | 36 | 975 |
| 1977-01-08 20:00 | -13.2°S, 124.4°E | Category 3 tropical cyclone | 38.6 | 973 |
| 1977-01-09 08:00 | -13.4°S, 124.9°E | Category 3 tropical cyclone | 43.7 | 970 |
| 1977-01-09 20:00 | -13.8°S, 124.2°E | Category 3 tropical cyclone | 43.7 | 970 |
| 1977-01-10 08:00 | -14.2°S, 122.3°E | Category 3 tropical cyclone | 43.7 | 970 |
| 1977-01-10 20:00 | -14.6°S, 120.7°E | Category 3 tropical cyclone | 41.2 | 976 |
| 1977-01-11 08:00 | -15.5°S, 119.1°E | Category 3 tropical cyclone | 36 | 985 |
| 1977-01-11 20:00 | -16.3°S, 117.8°E | Category 2 Tropical Cyclone | 30.9 | 990 |
| 1977-01-12 08:00 | -17.1°S, 116.6°E | Category 1 Tropical Cyclone | 20.6 | 995 |
| 1977-01-12 20:00 | -17.3°S, 115.1°E | Category 1 Tropical Cyclone | 20.6 | 1001 |
| 1977-01-13 08:00 | -17.0°S, 112.6°E | Tropical Depression | 18 | 1005 |
Data sources: NOAA National Centers for Environmental Information IBTrACS v04r01 (Knapp et al., 2010), code 1977006S11121 / SH061977. No official Chinese name is available for this area, so the original English name is used. Intensity categories follow the classification of the local agency for the region, converted from 1-minute sustained wind using the WMO factor, for reference only. Data notes · Incorrect translation?
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