The SummaryTyphoon Thelma (international code 197704) is a 1977 Northwest Pacific typhoon; peak intensity Severe Typhoon, max wind 43m/s, minimum central pressure 950hPa, not in China Landfall, 1977-07-26 was numbered off, recording 21 track points.
Typhoon Thelma, international code 197704, international name THELMA, 1977 Northwest Pacific typhoon. Formed: 1977-07-21 00:00:00, ended: 1977-07-26 00:00:00. Peak intensity: Severe Typhoon, minimum central pressure: 950 hPa, max wind: 43m/s.
Typhoon Thelma at 1977-07-21 00:00:00 at 14.6°N, 130.1°E over the Northwest Pacific; initial intensity: Nameless.
It peaked at Severe Typhoon intensity with max winds of 43 m/s (~155 km/h) and a minimum central pressure of 950hPa, recorded at 1977-07-23 18:00:00.
1977-07-26 00:00:00 After, Typhoon Thelma gradually weakened and was numbered off on 1977-07-26 00:00:00 was numbered off; its lifecycle recorded 21 track points.
1977年第4号Typhoon “Thelma”的生命史始 at Northwest Pacific洋面, 整体路径呈现稳定的NW toward MovingTrend, 未出现明显的Landfall记录. 从 formed初期的坐标序列来看, Typhoon at 7月21日00时在(14.6°N, 130.1°E)附近 formed, 初始阶段 toward NW direction缓慢推进. 在7月21日至7月24日期间, 其The latitude从14.6°N持续上升至20.4°N, During从130.1°EW移至119.7°E, 显示出强劲的NW行进动力. 值得注意的是, 在7月24日18时左右, Typhoon 中心到达(21.2°N, 119.9°E)后, Moving direction发生微妙变化, 经度开始略微E退至120.2°E, 随后在7月25日至26日期间转为近乎正N, 最终 at 7月26日00时到达(26.3°N, 119.8°E). 这种由NW转 toward 正N的路径折角, 通常暗示着副热带高压脊线的减弱或断裂, 引导气流发生改变.
In terms of intensity evolution, “Thelma” underwent a typical rapid enhancement to peak maintenance and gradually weakening process. Starting from the 21st of July’s Nameless (15m/s), the system rapidly intensified into Severe Tropical Storm within 36h, and upgraded to Typhoon at 22nd of July at 18h. Intensity then continued to climb, until 23rd of July at 18th to peak, confirming Severe Typhoon level, max wind up to 43m/s. The peak intensity wasined within the subsequent 24h, until 25th of July at 00 am began to weaken significantly, wind speed dropped to 41m/s and gradually declined to Typhoon and Severe Tropical Storm.
Compared with the same name History, the 1977 'Thelma' Intensity performance is more prominent. Compared with the 1991 at the 1983 and 1980 only reached the Tropical Storm or Severe Tropical Storm level of the same name Typhoon, the 1977 system reached the Severe Typhoon level. however, its Intensity is still low at the 1987 at the Super Typhoon level of the 'Thelma'. This suggests that in the 'Thelma' name sequence, the 1977 typhoon belongs to the medium-high-intensity individual, has a stronger destruction potential, although it ultimately does not directly impact landfall, but its near-sea high intensity maintenance still needs to cause high attention to meteorological analysis.
| Time | The latitude | During | Intensity | Wind (m/s) | Pressure (hPa) | Moving toward |
|---|---|---|---|---|---|---|
| 1977-07-21 00:00:00 | 14.6°N | 130.1°E | Nameless | 15 | 1004 | |
| 1977-07-21 06:00:00 | 15.2°N | 129°E | Nameless | 17 | 1000 | |
| 1977-07-21 12:00:00 | 15.6°N | 128.1°E | Tropical Storm | 20 | 992 | |
| 1977-07-21 18:00:00 | 15.9°N | 127.6°E | Tropical Storm | 23 | 990 | |
| 1977-07-22 00:00:00 | 16.2°N | 127.1°E | Severe Tropical Storm | 25 | 985 | |
| 1977-07-22 06:00:00 | 16.5°N | 126.2°E | Severe Tropical Storm | 28 | 985 | |
| 1977-07-22 12:00:00 | 16.9°N | 125.4°E | Severe Tropical Storm | 30 | 975 | |
| 1977-07-22 18:00:00 | 17.2°N | 124.6°E | Typhoon | 33 | 970 | |
| 1977-07-23 00:00:00 | 17.5°N | 123.8°E | Typhoon | 35 | 960 | |
| 1977-07-23 06:00:00 | 18°N | 123.1°E | Typhoon | 38 | 950 | |
| 1977-07-23 12:00:00 | 18.6°N | 122.4°E | Typhoon | 41 | 955 | |
| 1977-07-23 18:00:00 | 19.1°N | 121.6°E | Severe Typhoon | 43 | 960 | |
| 1977-07-24 00:00:00 | 19.6°N | 120.7°E | Severe Typhoon | 43 | 960 | |
| 1977-07-24 06:00:00 | 20°N | 120°E | Severe Typhoon | 43 | 960 | |
| 1977-07-24 12:00:00 | 20.4°N | 119.7°E | Severe Typhoon | 43 | 960 | |
| 1977-07-24 18:00:00 | 21.2°N | 119.9°E | Severe Typhoon | 43 | 960 | |
| 1977-07-25 00:00:00 | 22.2°N | 120.2°E | Typhoon | 41 | 965 | |
| 1977-07-25 06:00:00 | 23.2°N | 120.2°E | Typhoon | 38 | 980 | |
| 1977-07-25 12:00:00 | 24.2°N | 120.1°E | Typhoon | 33 | 992 | |
| 1977-07-25 18:00:00 | 25.2°N | 120°E | Severe Tropical Storm | 30 | 996 | |
| 1977-07-26 00:00:00 | 26.3°N | 119.8°E | Severe Tropical Storm | 25 | - |
International code for Typhoon Thelma is 197704, is the 4th Typhoon of 1977, international name THELMA.
Typhoon Thelma peak intensity is Severe Typhoon, max wind 43m/s, minimum central pressure 950 hPa.
According to records, the Typhoon Thelma is not in our coastal Landfall.
TyphoonSays (taifengshuo.com) provides typhoon Thelma's Track history map, multinational meteorological agency Forecast comparison, wind range with IntensityTrend, page address: https://taifengshuo.com/typhoon/197704.
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