宁夏吴忠“7·11”大暴雨成因及雷达回波特征分析

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Abstract Using conventional observation data,ERA5 reanalysis data and CINRAD/CA radar data of Wuzhong City,this paper analyzes the causes and radar echo characteristics of the heavy rainstorm that occurred in Wuzhong City from July 10 to November 2022.The results show that the formation of this heavy rainstorm is the result of the synergy of multiple weather systems,such as high trough,plateau vortex,shear line and low level jet.In this process,the steady maintenance and further development of low-level jet and shear line provided abundant water vapor transport for rainstorm,and created a favorable low-level convergence and uplift environment,which together contributed to the generation and development of mesoscale convective system;During periods of heavy precipitation,the low-level jet stream exhibits a significant strengthening phenomenon,with its vertical thickness increasing and expanding towards the lower atmosphere.At the same time,the jet stream couples with the southwest airflow in the front of the trough,resulting in a band like distribution of convective cells.The propagation path of convective cells is generally parallel to the direction of high-value areas of pseudo equivalent potential temperature(θ_se),while the maximum precipitation intensity occurs in areas with significant pseudo equivalent potential temperature gradients;Radar precipitation echoes have the characteristic of "train effect";The early precipitation is caused by the mesoscale convergence line on the ground and is directly affected by the surface low-pressure convective system;Due to the continuous low pressure and the mesoscale convergence line,the precipitation in the later period moved less,so that the central part of Wuzhong City constantly triggered the merging of new convection,which eventually led to the "July 11" heavy rainstorm in Wuzhong City.

Key words： rainstorm low-level jet stream ground convergence line Wuzhong City

Received: 16 July 2025

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	Li Jinxia
	Wei Yue'e
	Zhang Binbin
	Du Hongjuan

Cite this article:

Li Jinxia,Wei Yue'e,Zhang Binbin等. Analysis of causes and radar echo characteristics of "July 11" heavy rainstorm in Wuzhong,Ningxia[J]. Meteorological Hydrological and Marine Instrument, 2026, 43(1): 82-85.

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http://www.qxswhy.com/EN/ OR http://www.qxswhy.com/EN/Y2026/V43/I1/82

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