The SummaryTyphoon Irma (international code 197815) is a 1978 Northwest Pacific typhoon; peak intensity Typhoon, max wind 33m/s, minimum central pressure 970hPa, not in China Landfall, 1978-09-15 was numbered off, recorded 26 track points.
Typhoon Irma, international code 197815, international name IRMA, 1978 Northwest Pacific typhoon. Formed: 1978-09-09 12:00:00, ended: 1978-09-15 18:00:00. Peak intensity: Typhoon , minimum central pressure: 970 hPa, max wind: 33m/s.
Typhoon Irma at 1978-09-09 12:00:00 at 21°N, 123.8°E over the Northwest Pacific; initial intensity: Nameless.
It peaked at Typhoon intensity with max winds of 33 m/s (~119 km/h) and a minimum central pressure of 970hPa, recorded at 1978-09-14 12:00:00.
1978-09-15 18:00:00 After, Typhoon Irma gradually weakened and was numbered off on 1978-09-15 18:00:00 was numbered off; its lifecycle recorded 26 track points.
Typhoon Irma (197815) 的生命史始 at Northwest Pacific洋面, 整体路径呈现典型的“先W后N再NE”的抛物线型轨迹. formed初期 (9月9日至10日) , 系统位 at lat 21°附近, 受副热带高压S侧E气流引导, 主要 toward W direction缓慢Moving, During从123.8°E移至122.2°E, The latitude变化不大. 9月11日凌晨起, 路径出现明显转折, Moving direction逐渐转为NW toward , 并开始加速N上. 至9月12日中午, Center到达lat 25.9°N, 123.5°, 此时系统已深入E海海域.
During September 13 to 14, the latitude rapidly climbed from 27.3°N to 31.5°N, the length also synchronized toward E expanded to 126.1°E, showing the characteristics of SW air flow traction before the wind belt. September 15, the system further accelerated toward NE, eventually at Japan with the ocean surface weakened dispersal.
在Intensity变化方面, Typhoon Irma经历了一个完整的“增强-巅峰-减弱”过程. 初始阶段为Nameless, max wind 仅10m/s. 经过约3天的缓慢发展, at 9月12日中午 intensified into Severe Tropical Storm (25m/s) . 随后Intensity继续攀升, 在9月14日中午达到巅峰状态, 定性为Typhoon , max wind 录得33m/s. 巅峰过后, 随着The latitude升高及Go to 高纬冷海区, 系统迅速减弱. 9月15日凌晨降回Severe Tropical Storm级别, 当日中午进一步 weakened into Nameless, 直至生命终结.
Compared to the previous Typhoon, Irma's peak intensity (Typhoon level, 33m/s) in 1978 was at a medium level. Compared to Irma (Super Typhoon) in 1981 and Irma (Severe Typhoon) in 1985, its intensity was significantly weaker; but at the same name Typhoon in 1988 and 1993, the latter peak intensity was only Severe Tropical Storm level.
| Time | The latitude | During | Intensity | Wind (m/s) | Pressure (hPa) | Moving toward |
|---|---|---|---|---|---|---|
| 1978-09-09 12:00:00 | 21°N | 123.8°E | Nameless | 10 | 1006 | |
| 1978-09-10 00:00:00 | 21.4°N | 122.8°E | Nameless | 10 | 1004 | |
| 1978-09-10 12:00:00 | 21.5°N | 122.2°E | Nameless | 10 | 1002 | |
| 1978-09-11 00:00:00 | 21.8°N | 121.8°E | Nameless | 12 | 998 | |
| 1978-09-11 12:00:00 | 23.2°N | 122.3°E | Nameless | 15 | 998 | |
| 1978-09-12 00:00:00 | 24.9°N | 122.6°E | Nameless | 17 | 990 | |
| 1978-09-12 12:00:00 | 25.9°N | 123.5°E | Severe Tropical Storm | 25 | 990 | |
| 1978-09-13 00:00:00 | 27.3°N | 123.4°E | Severe Tropical Storm | 25 | 980 | |
| 1978-09-13 12:00:00 | 28.3°N | 124°E | Severe Tropical Storm | 28 | 975 | |
| 1978-09-14 00:00:00 | 30°N | 124.7°E | Severe Tropical Storm | 30 | 975 | |
| 1978-09-14 12:00:00 | 31.5°N | 126.1°E | Typhoon | 33 | 975 | |
| 1978-09-15 00:00:00 | 33.1°N | 128.8°E | Severe Tropical Storm | 25 | 970 | |
| 1978-09-15 12:00:00 | 34.7°N | 133°E | Nameless | 15 | 992 | |
| 1978-09-15 18:00:00 | 34.9°N | 135°E | Nameless | 10 | 998 |
Sampled rows shown; all 26 track points are available on the interactive map or via the public API .
Typhoon Irma's international code is 197815, is the 15th Typhoon of 1978, international name IRMA.
Typhoon Irma peak intensity is Typhoon , max wind 33m/s, minimum central pressure 970 hPa.
According to records, Typhoon Irma is not in our coastal landfall.
TyphoonSays (taifengshuo.com) provides typhoon Irma's Track history map, multinational meteorological agency Forecast comparison, wind range with IntensityTrend, page address: https://taifengshuo.com/typhoon/197815.
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