Hurricane Helga
● Data reliability: ReliableWeather satellites monitored it throughout, so its track and intensity are relatively accurate (Atlantic and E. Pacific since 1966, other basins since 1980).
Helga at 1974-08-10 08:00:00 (BeijingTime) 在East Pacific首次被记录, peak intensity 为Tropical Storm, max wind 约 20.6 m/s (1 分钟平均) , at 1974-08-13 20:00:00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 |
|---|
| 1974-08-10 08:00 | 13.1°N, 109.4°W | Tropical Depression | 12.9 | - |
| 1974-08-10 14:00 | 13.6°N, 111.4°W | Tropical Depression | 12.9 | - |
| 1974-08-10 20:00 | 14.0°N, 113.0°W | Tropical Depression | 12.9 | - |
| 1974-08-11 02:00 | 14.3°N, 114.2°W | Tropical Storm | 18 | - |
| 1974-08-11 08:00 | 14.5°N, 115.3°W | Tropical Storm | 18 | - |
| 1974-08-11 14:00 | 14.7°N, 116.4°W | Tropical Storm | 18 | - |
| 1974-08-11 20:00 | 14.9°N, 117.4°W | Tropical Storm | 18 | - |
| 1974-08-12 02:00 | 15.0°N, 118.4°W | Tropical Storm | 20.6 | - |
| 1974-08-12 08:00 | 15.1°N, 119.3°W | Tropical Storm | 20.6 | - |
| 1974-08-12 14:00 | 15.4°N, 120.0°W | Tropical Storm | 18 | - |
| 1974-08-12 20:00 | 15.7°N, 120.8°W | Tropical Storm | 18 | - |
| 1974-08-13 02:00 | 15.9°N, 121.5°W | Tropical Depression | 15.4 | - |
| 1974-08-13 08:00 | 16.1°N, 122.3°W | Tropical Depression | 12.9 | - |
| 1974-08-13 14:00 | 16.1°N, 123.1°W | Tropical Depression | 12.9 | - |
| 1974-08-13 20:00 | 16.1°N, 123.9°W | Tropical Depression | 12.9 | - |
Data sources: NOAA National Centers for Environmental Information IBTrACS v04r01 (Knapp et al., 2010), code 1974222N13251 / EP081974. This basin has no official Chinese name, so the original English name is shown. Intensity grades follow the classifications of the relevant local agencies, converted from 1-minute sustained winds using the WMO factor, and are for reference only. Data notes · Incorrect translation?
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