Tropical Cyclone Helen
● 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.
Helen at 1970-04-13 20:00:00 (BeijingTime) 在South Pacific首次被记录, peak intensity 为Category 1 Tropical Cyclone , max wind 约 22.1 m/s (1 分钟平均) , minimum central pressure 990 hPa, at 1970-04-17 08:00:00前后结束, total 记录 15 track points (6 h一个) .
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1970-04-13 20:00 | -14.8°S, 176.0°W | Tropical Cyclone | - | - |
| 1970-04-14 02:00 | -15.8°S, 175.4°W | Category 1 Tropical Cyclone | 22.1 | 990 |
| 1970-04-14 08:00 | -16.5°S, 174.9°W | Tropical Cyclone | - | - |
| 1970-04-14 14:00 | -16.9°S, 174.4°W | Category 1 Tropical Cyclone | 22.1 | 990 |
| 1970-04-14 20:00 | -17.1°S, 173.9°W | Tropical Cyclone | - | - |
| 1970-04-15 02:00 | -17.2°S, 173.3°W | Category 1 Tropical Cyclone | 22.1 | 990 |
| 1970-04-15 08:00 | -17.4°S, 173.1°W | Tropical Cyclone | - | - |
| 1970-04-15 14:00 | -17.8°S, 173.2°W | Tropical Depression | 16.5 | 997 |
| 1970-04-15 20:00 | -18.2°S, 173.7°W | Tropical Cyclone | - | - |
| 1970-04-16 02:00 | -18.4°S, 174.3°W | Tropical Depression | 16.5 | 997 |
| 1970-04-16 08:00 | -18.6°S, 174.9°W | Tropical Cyclone | - | - |
| 1970-04-16 14:00 | -18.9°S, 175.6°W | Tropical Depression | 16.5 | 997 |
| 1970-04-16 20:00 | -19.4°S, 176.2°W | Tropical Cyclone | - | - |
| 1970-04-17 02:00 | -19.9°S, 176.3°W | Tropical Depression | 16.5 | 997 |
| 1970-04-17 08:00 | -20.4°S, 175.7°W | Tropical Cyclone | - | - |
Data sources: NOAA National Environmental Information Center IBTrACS v04r01 (Knapp et al., 2010), code 1970104S15184 / SH301970. There is no official Chinese name for this system, so the original English name is used. Ratings follow the classification by the local agency in the region and are converted from 1-minute sustained winds using the WMO factor. For reference only. Data notes · Incorrect translation?
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