Typhoon Thelma trajectory analysis
Track and Movement Characteristics
Typhoon Thelma (198017) 的生命周期始 at Northwest Pacific远洋海域, 整体路径呈现典型的“NW—NE”转 toward 抛物线形态. formed初期 (9月25日至26日) , 系统位 at 146°E至147°E之间, 维持Tropical DepressionIntensity, 以缓慢速度 toward NW, 纬度从15.5°N逐步N抬至17.8°N. Go to 9月27日后, 移速略有加快, 持续 toward NNW direction推进, 经度逐渐W移至142°E附近.
A key turning point in the track occurred around noon on September 28. At that time, the typhoon center was located at 24.5°N, 142.4°E. Subsequently, the direction of movement changed significantly, shifting from northwest to northeast. This turn was accompanied by a rapid northward increase in latitude, rising quickly from 24.5°N to 37.3°N by September 30, while the longitude shifted eastward to 155.8°E. Throughout its entire lifecycle, this typhoon did not make landfall on any landmass, remaining over the ocean until it weakened and dissipated in high-latitude waters.
Intensity evolution and historical comparison
Regarding intensity changes, Thelma underwent a complete development process from a tropical depression to a severe tropical storm. From September 25 to 27, the system remained a tropical depression for an extended period, with maximum sustained winds fluctuating between 7 m/s and 17 m/s. At 12:00 on September 28, as the maximum sustained winds near the center increased to 20 m/s, the system was officially upgraded to a tropical storm and intensified rapidly thereafter. From 06:00 to 18:00 on September 29, the typhoon reached its peak intensity, classified as a severe tropical storm, with maximum sustained winds stabilizing at 28 m/s. Subsequently, influenced by high-latitude environmental factors, the intensity began to weaken. At 00:00 on September 30, it was downgraded to a tropical storm, maintaining wind speeds of 23 m/s until the end of its lifecycle.
Its peak intensity is only Severe Tropical Storm (28m/s), far lower at 1987 Thelma (Super Typhoon) and 1977 Thelma (Severe Typhoon). compared with 1991 Thelma (Tropical Storm) slightly stronger, with 1983 Thelma (Severe Tropical Storm) Intensity level comparable.
Typhoon Thelma routes
| Time | Position | Intensity | Wind · Pressure | Move toward |
|---|
| 09-25 08:00 | 14.5°N
147°E | Tropical Depression | 9 m/s
1006 hPa | - |
| 09-25 20:00 | 14°N
145°E | Tropical Depression | 10 m/s
1003 hPa | WSW |
| 09-26 08:00 | 15°N
142.5°E | Tropical Depression | 15 m/s
1003 hPa | WNW |
| 09-26 20:00 | 16°N
140.6°E | Tropical Depression | 15 m/s
1000 hPa | NW |
| 09-27 08:00 | 18.2°N
140.2°E | Tropical Depression | 15 m/s
998 hPa | N |
| 09-27 20:00 | 21.5°N
141.9°E | Tropical Depression | 15 m/s
994 hPa | NE |
| 09-28 08:00 | 21.7°N
142.1°E | Tropical Storm | 20 m/s
992 hPa | WSW |
| 09-28 20:00 | 24.3°N
142.8°E | Severe Tropical Storm | 25 m/s
990 hPa | NNE |
| 09-29 08:00 | 26.9°N
143.2°E | Severe Tropical Storm | 30 m/s
985 hPa | N |
| 09-29 20:00 | 29.3°N
144.2°E | Severe Tropical Storm | 30 m/s
982 hPa | NNE |
| 09-30 08:00 | 33.6°N
147.6°E | Severe Tropical Storm | 30 m/s
980 hPa | NE |
| 09-30 20:00 | 40°N
153°E | Severe Tropical Storm | 25 m/s
980 hPa | NE |
Sampled rows shown; all 23 track points are available on the interactive map or via the public API .
FAQ
Thelma was the 1980 Typhoon.
198017 is the historical number retained by the CMA for Typhoon Thelma (the 17th typhoon of 1980). Its international name was THELMA. International numbering in the Northwest Pacific did not begin until 1981. Before then, agencies used separate numbering systems, so the numbers assigned by JMA (Japan), the Joint Typhoon Warning Center (USA), and China’s meteorological authorities may differ and cannot be compared directly.
Where does the track data for Typhoon Thelma come from?
Track data sources: China Meteorological Administration Tropical Cyclone Best Track Dataset (CMA-STI); wind speeds are 2-minute sustained wind speeds.
What is the most powerful Typhoon Thelma?
Typhoon Thelma peak intensity is Severe Tropical Storm, max wind 30m/s, minimum central pressure 978 hPa.
Is the Typhoon Thelma Landfall?
According to records, the Typhoon Thelma is not in our coastal Landfall.
Where can I view typhoon Thelma's live track map?
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/198017.
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