Analysis of the characteristics of typhoons affecting the Bohai Rim region in the north and its typical heavy rainstorms
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Author: Yang Xiaoliang1 Yang Min2 Long Xuanxue 1 Yang Lu Yuci 1 Wang Haichuan 1 Yang Yue3
Units: 1. Hebei Meteorological Observatory, Shijiazhuang 050021, China;
2. Hebei Meteorological Administrative Technical Service Center, Shijiazhuang 050021, China;
3. Zhangjiakou Meteorological Bureau, Zhangjiakou 075000, China
Classification number: P444
Publication Year, Volume, Issue (page number): 2021.38,Issue 4 (99-106)
Abstract: The best path data of tropical cyclones from 1949 to 2019, the ground precipitation data of Beijing-Tianjin-Hebei and the re-analysis data of NCEP were used to analyze the northern typhoons affecting the Bohai Rim region and various typical heavy rainstorms. The results showed that there were 47 cases of typhoons affecting the Bohai Rim region between 71 a, with an average of about 6.6/10 a, mainly from late July to August, with the most frequent landfalls in the coastal areas of Fujian, Zhejiang and southern Jiangsu, and the landing turning point was generally located east of 115 °E. Classified according to the classification of landing congestion, landing northbound, landing turn, coastal path and westward turning path, the landing congestion type heavy rainstorm area is mainly located in front of the Taihang Mountains in southern Hebei; the landing northbound, landing turn or coastal path heavy rainstorm is mainly located in the central and eastern part of Beijing-Tianjin-Hebei, and the heavy rainfall area is closely related to the western Pacific sub-high, westerly wind belt system, low-altitude rapids and terrain.
Keywords: typhoon northbound; heavy rain; path
Abstract：Using the optimum route data during 1949 to 2019, precipitation data in Beijing-Tianjin-Hebei region and NCEP reanalysis data, the characteristics of northward-moving typhoons and various typical heavy rainfalls affecting the Bohai rim region is analyzed in this paper. The results show that there are 47 typhoons moving northward and affecting the Bohai Rim Region in the recent 71 years with an average frequency of 6.6 per decade. The typhoons mainly generate between late July and August, and make landfall in Fujian, Zhejiang and southern Jiangsu province with the turning point of landfall east of about 115° E. The typhoon routes can be classified into 5 different types, which are blocking after landing, moving northward after landing, veering after landing, moving along the coast and moving westward. For the type of blocking after landing, the heavy rainfall mainly occurs in front of Taihang Mountains in southern Hebei province. For the rest of the types except moving westward, heavy rainfall tends to be most common over the middle east of the Beijing-Tianjin-Hebei region. The region of the heavy rainfall is also closely affected by the West Pacific Subtropical High, the westerlies, low-level jet stream and topography.
Key words：northward-moving typhoon; heavy rainfall; route
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There are light waves to medium waves of 0.8 to 1.8 meters in the northern part of the Bohai Sea, the Yellow Sea and the East China Sea;
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There are medium waves of 1.3 to 1.8 meters in the southern south of the South China Sea;
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The Bashi Strait and the Midwave Area east of Taiwan are 1.5 to 2.3 meters away.
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