Comparative Analysis of Two Severe Convective Weather Processes in Shandong Under Background of North China Cold Vortex
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Abstract:
This paper compares and analyzes different types of strong convective weather under the background of the North China cold vortex that occurred in two similar circulation situations in Shandong based on ground and highaltitude observations, NCEP 1°×1° Reanalysis data and Doppler radar data. The results show that the strong convection weather process on 14 June 2016 (6·14) was dominated by thunderstorm gale and short-term heavy precipitation, which occurred in the low-level vertical wind shear, and there was relatively deep warm and moist advection in the middle and lower troposphere (400 to 900 hPa) with abundant water vapour transport. At the same time, the height of the 0 ℃ and -20 ℃ layers would rise, which was conducive to short-term heavy precipitation but not hail generation. The strong convective weather process on 13 June 2018 (6·13) was dominated by thunderstorm gale and hail, which occurred in strong conditional instability layers and strong low-level vertical wind shear, and the simultaneous enhancement of 400 to 500 hPa cold advection and low-level warm advection was conducive to the further increase of the vertical decline rate of temperature in the middle troposphere, resulting in the further decline of -20 ℃ to -30 ℃ layer, and contributing to the occurrence environment of the large hail. The “6·14” strong convective weather process was triggered by the surface convergence line, and the “6·13” strong convective weather process was triggered by the front. The strong reflectivity factor of the “6·14” strong convective weather process was low in height, and there was no obvious high-hanging strong echo structure, which was conducive to the occurrence of short-term heavy precipitation, and the “6·13” strong convective weather process had the characteristics of the dense single structure and obvious high hanging strong echo structure. Therefore, the convective intensity of the “6·13” strong convective weather process was stronger and more prone to hail.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.