Typhoon Polly trajectory analysis
Track and Turning Characteristics
Typhoon Polly (197415) 的生命史始 at Northwest Pacific远洋海域, 整体路径呈现典型的“抛物线”型Moving特征. formed初期 (8月25日至26日) , 系统位 at 16°N附近, 主要 toward W, 随后逐渐转为NW direction. 8月27日至29日期间, 随着纬度N抬至22.5°N, 其Moving direction稳定指 toward NNW, 并在该阶段达到生命史中的最N端转折点前奏.
The key turning process occurred between August 29 and 30. As the center reached approximately 26.1°N, 140.5°E, the typhoon maintained severe typhoon intensity before its track turned markedly eastward. After September began, the system turned fully northeastward, crossed waters east of Japan, and moved deep into the high latitudes. During its entire lifecycle, the typhoon made no landfall and remained over the ocean, eventually weakening into a tropical depression near 42.9°N, 141°E on September 5, when monitoring ended. This track, formed far offshore, turned near Japan, and ultimately transformed and dissipated, avoided the direct impacts of landfall but still posed significant wind and wave threats to surrounding waters during its turns.
Intensity evolution and historical comparison
Polly’s intensity evolved through three stages: rapid intensification, a sustained peak, and gradual weakening. Starting as a tropical depression on August 25 with winds of 10 m/s and a central pressure of 1005 hPa, the system strengthened rapidly within four days. Particularly from August 26 to 29, pressure plummeted from 1003 hPa to 948 hPa while maximum winds surged from 15 m/s to 50 m/s, establishing its severe typhoon peak intensity. Notably, from 02:00 to 20:00 on August 29, its core intensity remained at 50 m/s despite continued northward movement, indicating strong structural stability.
After turning northeastward, the typhoon began to weaken under the influence of cold high-latitude waters and vertical wind shear. After September 1, its wind speed fell below 35 m/s and pressure rose above 955 hPa, leading to its downgrade to a severe tropical storm on September 2. It ultimately weakened further into a tropical depression on September 4.
Compared with previous typhoons of the same name, Polly in 1974 was significantly more intense. Its minimum central pressure of 948 hPa was far lower than those of Polly in 1995 at 960 hPa, Polly in 1992 at 975 hPa, and Polly in 1978 and 1971 at 985 hPa and 980 hPa, respectively. The latter four reached peak intensities of only typhoon or severe tropical storm status, while Polly in 1974 was the only one recorded as reaching severe typhoon intensity, demonstrating the system’s exceptional development potential that year in the Northwest Pacific.
Typhoon Polly track data table
| Time | Position | Intensity | Wind · Pressure | Move toward |
|---|
| 08-25 08:00 | 16.9°N
151.4°E | Tropical Depression | 10 m/s
1005 hPa | - |
| 08-26 02:00 | 16.3°N
147.7°E | Tropical Depression | 15 m/s
1003 hPa | WSW |
| 08-26 20:00 | 15.5°N
146.3°E | Tropical Storm | 20 m/s
992 hPa | NW |
| 08-27 14:00 | 16.7°N
145.5°E | Severe Tropical Storm | 30 m/s
978 hPa | NW |
| 08-28 08:00 | 19.7°N
143.4°E | Typhoon | 40 m/s
965 hPa | NW |
| 08-29 02:00 | 22.5°N
141°E | Severe Typhoon | 50 m/s
948 hPa | NW |
| 08-29 20:00 | 26.1°N
140.5°E | Severe Typhoon | 50 m/s
952 hPa | NNE |
| 08-30 14:00 | 29.3°N
139.3°E | Typhoon | 40 m/s
955 hPa | NW |
| 08-31 08:00 | 30.8°N
136.8°E | Typhoon | 35 m/s
955 hPa | WNW |
| 09-01 02:00 | 31.2°N
134.2°E | Typhoon | 35 m/s
955 hPa | W |
| 09-01 20:00 | 34°N
132.6°E | Severe Tropical Storm | 30 m/s
965 hPa | NNW |
| 09-02 14:00 | 38.2°N
131.1°E | Severe Tropical Storm | 25 m/s
985 hPa | NNW |
| 09-03 08:00 | 42.8°N
134.8°E | Tropical Storm | 20 m/s
985 hPa | NE |
| 09-04 02:00 | 44.8°N
137.2°E | Tropical Storm | 20 m/s
995 hPa | NE |
| 09-04 20:00 | 44.8°N
139.8°E | Tropical Depression | 15 m/s
1000 hPa | ESE |
| 09-05 08:00 | 42.9°N
141°E | Tropical Depression | 12 m/s
1000 hPa | SSE |
Sampled rows shown; all 45 track points are available on the interactive map or via the public API .
FAQ
Typhoon Polly was the 1974 Typhoon.
The number 197415 associated with Typhoon Polly is the historical identifier retained by the CMA, meaning the 15th typhoon of 1974, while its international name was POLLY. The international numbering system for the Northwest Pacific began in 1981; before then, individual agencies assigned their own numbers. The numbers used by the JMA in Japan, the Joint Typhoon Warning Center in the United States, and China’s meteorological agencies for the same typhoon could differ and cannot be compared directly.
Where does the track data for Typhoon Polly come from?
Path. Data sources: China Meteorological Administration Tropical Cyclone Best Track Dataset (CMA-STI); wind speed refers to 2-min sustained wind speed. Track points at intermediate times are encrypted based on original operational positioning data, while wind speed and pressure are interpolated using best-track anchor points.
What was the peak intensity of Typhoon Polly?
Typhoon Polly peak intensity is Severe Typhoon, max wind 50m/s, minimum central pressure 948 hPa.
Did Typhoon Polly make landfall?
According to the records, Typhoon Polly did not make landfall along China's coast.
Where can I view typhoon Polly's live track map?
TyphoonSays (taifengshuo.com) provides typhoon Polly's Track history map, multinational meteorological agency Forecast comparison, wind range with IntensityTrend, page address: https://taifengshuo.com/typhoon/197415.
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