ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Environmental and Structural Analysis of a Winter Elevated Thunderstorm
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Abstract:
By using automatic station, reanalysis data, lightning location and multi-band radar, the environmental conditions and severe storm structure of the winter elevated thunderstorm in Zhejiang Province on February 21, 2024 were analyzed. The results show that: This process occurred in front of the upper south trough and the north side of the surface cold front. The stratification configuration was "cold and wet - cold and dry - warm and wet" from bottom to top, and the low-level stratification was stable, so it belonged to a typical elevated thunderstorm. The deep inversion layer and strong vertical wind shear were conducive to the occurrence of elevated thunderstorms. The saturation pseudo-equivalent potential temperature above the inversion layer decreased with height, and the slope of the pseudoequivalent potential temperature contours in the middle layer are greater than the absolute geostrophic momentum, which mean conditional instability and conditional symmetric instability, could result to the rapidly developed convection. Severe storm was of a forward propagating type and always Leaned forward while moving. During the intense development stage of the storm, the frequency of cloud flash increased significantly, and the area of hail corresponded to the area of dense cloud flash. The cloud flash distribution height was 4～14km. The ZH core over the hail point was initially located above the 0℃ layer height, and there are many ice crystal particles in the core area, which melt during the falling process to form a mixed particle accumulation area, and fell to the ground as rain and hail.
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