The SummaryTyphoon Ivy (international code 197111) is a 1971 Northwest Pacific typhoon; peak intensity Severe Tropical Storm, max wind 30m/s, minimum central pressure 990hPa, not in China Landfall, 1971-07-07 was numbered off, recorded 11 track points.
Typhoon Ivy, international code 197111, international name IVY, 1971 Northwest Pacific typhoon. Formed: 1971-07-05 06:00:00, ended: 1971-07-07 18:00:00. Peak intensity: Severe Tropical Storm, minimum central pressure: 990 hPa, max wind: 30m/s.
Typhoon Ivy at 1971-07-05 06:00:00 at 22.6°N, 134.8°E over the Northwest Pacific; initial intensity: Severe Tropical Storm.
It peaked at Severe Tropical Storm intensity with max winds of 30 m/s (~108 km/h) and a minimum central pressure of 990hPa, recorded at 1971-07-06 00:00:00.
1971-07-07 18:00:00 After, Typhoon Ivy gradually weakened and was numbered off on 1971-07-07 18:00:00 was numbered off; its lifecycle recorded 11 track points.
Typhoon Ivy (197111)'s life history is short, from formed to dispersed only about 60h. Its entire pathway presents a significant 'first N after NE' Palladium-like Moving characteristic. In the early days of life (July 5, 06:00 to 18:00) , the system position at lat 22.6° to 26.1°N, 134.2° to 134.8° ocean area, main toward N direction rapid Moving, latitude jumping up about 3.5 degrees within 12h, length changes slightly, showing its sub-tropical high-pressure W side air flow guidance obvious.
During the period from 00:00 to 12:00 on July 6, the Typhoon continued to N and slightly twisted, reaching lat 29.8° N, near 132.7°, which can be considered a turning point of the path. Then, the system began toward NE, the length increased rapidly. July 6, 18:00 to 7:00, the Typhoon center moved from lng 133.3° to 140.4°, the latitude synchronized from 30.8° to 36.1°, indicating that it had fully Go to W wind belt control area, Moving speed accelerated and direction stable pointed toward Japan by E ocean.
In terms of intensity, Typhoon Ivyined the Severe Tropical Storm level for a longer time. July 5 06:00 formed wind speed at 25m/s, then enhanced to 28m/s within 6h, and at July 6 00:00 reached peak intensity, max wind 30m/s. Then until July 7 06:00, its wind speed has beenined between 25-30m/s, showing strong stability. July 7 12:00, with the latitude rising to 35°N by N, the system rapidly weakened into Tropical Storm (20m/s), and at the same day 18:00 further reduced to Nameless (15m/s), eventually dispersing on the high-latitude cold sea surface.
与历届同名Typhoon 相比, 1971年Ivy的Intensity明显偏弱. 数据显示, 1965年, 1974年及1977年的同名Typhoon peak intensity均达到Typhoon 或Severe Typhoon级别, 而1971年Ivy仅为Severe Tropical Storm. 这反映出不同年份大气环流背景对同名Typhoon formed与发展环境的显著差异, 1971年的系统未能获得足够的能量支持以发展为更高Intensity的热带气旋.
| Time | The latitude | During | Intensity | Wind (m/s) | Pressure (hPa) | Moving toward |
|---|---|---|---|---|---|---|
| 1971-07-05 06:00:00 | 22.6°N | 134.8°E | Severe Tropical Storm | 25 | 1000 | |
| 1971-07-05 12:00:00 | 23.7°N | 134.5°E | Severe Tropical Storm | 28 | 1000 | |
| 1971-07-05 18:00:00 | 26.1°N | 134.2°E | Severe Tropical Storm | 28 | 994 | |
| 1971-07-06 00:00:00 | 28.3°N | 133.6°E | Severe Tropical Storm | 30 | 994 | |
| 1971-07-06 06:00:00 | 29.3°N | 132.8°E | Severe Tropical Storm | 30 | 992 | |
| 1971-07-06 12:00:00 | 29.8°N | 132.7°E | Severe Tropical Storm | 30 | 990 | |
| 1971-07-06 18:00:00 | 30.8°N | 133.3°E | Severe Tropical Storm | 28 | 990 | |
| 1971-07-07 00:00:00 | 32.3°N | 134.8°E | Severe Tropical Storm | 28 | 990 | |
| 1971-07-07 06:00:00 | 33.6°N | 136.2°E | Severe Tropical Storm | 25 | 990 | |
| 1971-07-07 12:00:00 | 35°N | 138.1°E | Tropical Storm | 20 | 992 | |
| 1971-07-07 18:00:00 | 36.1°N | 140.4°E | Nameless | 15 | 994 |
International code for Typhoon Ivy is 197111, is the 11th Typhoon of 1971, international name IVY.
Typhoon Ivy peak intensity is Severe Tropical Storm, max wind 30m/s, minimum central pressure 990 hPa.
According to records, Typhoon Ivy is not in our coastal landfall.
TyphoonSays (taifengshuo.com) provides typhoon Ivy's Track history map, multinational meteorological agency Forecast comparison, wind range with IntensityTrend, page address: https://taifengshuo.com/typhoon/197111.
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