The SummaryTyphoon Helen (international code 197517) is a 1975 Northwest Pacific typhoon; peak intensity Tropical Storm, max wind 23m/s, minimum central pressure 1000hPa, not in China Landfall, 1975-11-04 was numbered off, recorded 15 track points.
Typhoon Helen, international code 197517, international name HELEN, 1975 Northwest Pacific typhoon. Formed: 1975-11-01 00:00:00, ended: 1975-11-04 12:00:00. Peak intensity: Tropical Storm, minimum central pressure: 1000 hPa, max wind: 23m/s.
Typhoon Helen at 1975-11-01 00:00:00 at 14°N, 125.2°E over the Northwest Pacific; initial intensity: Nameless.
It peaked at Tropical Storm intensity with max winds of 23 m/s (~83 km/h) and a minimum central pressure of 1000hPa, recorded at 1975-11-03 18:00:00.
1975-11-04 12:00:00 After, Typhoon Helen gradually weakened and was numbered off on 1975-11-04 12:00:00 was numbered off; its lifecycle recorded 15 track points.
Typhoon Helen (197517)'s life began at 00:00 on November 1, 1975, at the initial Position position at lat 14.0°N, 125.2° of the Nameless phase. In the first 48h after formed, the systemined a stable W toward Moving path, latitude variation very small, basically along the lat 14° to 15° parallel toward W forward.
While the overall remains toward WTrend, the latitude fluctuates slightly: first at 06 at 13.7°N, then at 12 at 13.9°N, and then at 18 at 13.3°N. This tiny latitude toward shock suggests that the guiding airflow may have a weak disturbance, but does not change its overall toward W through the central Vietnam Sea's macro path.
In the first half of the history of life (November 1 to November 2 12:00), the system continued to maintain NamelessIntensity, max wind constant to 12m/s. Until November 2 at 18, wind speed increased to 15m/s, marking intensity began to slowly climb. November 3 at 12, the system officially upgraded to Tropical Storm, max wind reached 20m/s, and at the same day at 18 at peak intensity, max wind to 23m/s. Peak stateined Time is shorter, then rapidly weakened, November 4 at 00wind speed dropped back to 20m/s, 06 at Nameless, and finally at 12 at 12m/swind speed history ended.
In comparison, in 1972 Helen had reached Super Typhoon level, in 1995 Helen for Typhoon level, in 1966 Helen for Severe Tropical Storm level. Only in 1992 Helen was the same with its Intensity level, all of which were Tropical Storm. This suggests that in 1975 Helen in the 'Helen' series Typhoon is a weaker member at Intensity, and supported by at lack of air pressure data, its structural density may be limited, failing to develop into a higher-level tropical cyclone.
| Time | The latitude | During | Intensity | Wind (m/s) | Pressure (hPa) | Moving toward |
|---|---|---|---|---|---|---|
| 1975-11-01 00:00:00 | 14°N | 125.2°E | Nameless | 12 | 1008 | |
| 1975-11-01 06:00:00 | 14.3°N | 124.2°E | Nameless | 12 | 1008 | |
| 1975-11-01 12:00:00 | 14.7°N | 123.2°E | Nameless | 12 | 1008 | |
| 1975-11-01 18:00:00 | 14.9°N | 122.1°E | Nameless | 12 | 1008 | |
| 1975-11-02 00:00:00 | 15°N | 120.9°E | Nameless | 12 | 1008 | |
| 1975-11-02 06:00:00 | 14.8°N | 119.7°E | Nameless | 12 | 1006 | |
| 1975-11-02 12:00:00 | 14.5°N | 118.6°E | Nameless | 12 | 1008 | |
| 1975-11-02 18:00:00 | 14.1°N | 117.3°E | Nameless | 15 | 1006 | |
| 1975-11-03 00:00:00 | 13.7°N | 115.9°E | Nameless | 15 | 1006 | |
| 1975-11-03 06:00:00 | 13.7°N | 114.4°E | Nameless | 17 | 1004 | |
| 1975-11-03 12:00:00 | 13.9°N | 113.1°E | Tropical Storm | 20 | 1000 | |
| 1975-11-03 18:00:00 | 13.3°N | 112.1°E | Tropical Storm | 23 | 1000 | |
| 1975-11-04 00:00:00 | 12.9°N | 111°E | Tropical Storm | 20 | 1000 | |
| 1975-11-04 06:00:00 | 12.9°N | 109.7°E | Nameless | 15 | 1000 | |
| 1975-11-04 12:00:00 | 12.9°N | 108.3°E | Nameless | 12 | 1008 |
Typhoon Helen's international code is 197517, is 1975's 17th Typhoon, international name HELEN.
Typhoon Helen peak intensity is Tropical Storm, max wind 23m/s, minimum central pressure 1000 hPa.
According to records, Typhoon Helen is not in our coastal landfall.
TyphoonSays (taifengshuo.com) provides typhoon Helen's Track history map, multinational meteorological agency Forecast comparison, windshield range with IntensityTrend, page address: https://taifengshuo.com/typhoon/197517.
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