Dual-polarization Radar Characteristic Analysis of a Heavy Hail Process in Northwest Hebei
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Abstract:
Based on the conventional meteorological data, ERA5 reanalysis data and Doppler radar data, a heavy hail weather process in northwestern Hebei Province on June 10, 2022, is analyzed. The results show that: (1) The hail occurred in the southeast quadrant of the cold vortex and the warm area in front of the low-level shear line. The convection was triggered by the local thermal factor and strengthened near the surface convergence line. (2) The hail process could be divided into three stages. The first two stages were formed by two different supercells, respectively. The identification results of hydrometeor were mainly dry hail particles. The radar echoes were characterized by high reflectivity, low differential reflectivity, high correlation coefficient and low differential phase. In the third stage, two supercells merged and formed. Besides hail, local flash rain also occurred. The flash rain was caused by large raindrops of larger diameter and more numerous. (3) The wind field retrieved by radar could be used to analyze the dynamic structure of convection cells, and the future moving direction and development trend of cells could be obtained by analyzing the dynamic structure of cells in different stages. In particular, the strength of updraft in the vertical profile had important indicative significance for the development trend of monomers.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.