Comparative Analysis of Radar Features and Environmental Backgrounds of Two Severe Convective Weather Events in Shandong
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Abstract:
By using the routine observation, automatic station and radar echo data, the environmental conditions and echo characteristics of two strong convective weather events in Shandong in June 2016 are analyzed. The results show: The storm on 14 June occurred under the circulation of cold air guided by a transversal trough and that on 30 June appeared under the circulation of the southwest air before the upperlevel trough. The ground mesoscale convergence zones were the trigger mechanism. The average wind speed of the vertical wind shear and storm bearing layer on 14 June was greater than that of 30 June, leading to the obvious strengthening of the storm and the longer duration of the supercell. The magnitude of SRH (Storm Relative Helicity) had a good indication for the strengthening of strong convective weather. Both processes formed near the ground convergence line and had mesocyclones, hanging strong echoes, BWER (Bounded Weak Echo Region), echo pendency, and storm top divergence. The differences were that there was an inverted Vshaped gap, middlelevel radial convergence, TBSS (ThreeBody Scattering Spike) and hook echoes on 14 June; narrow band echoes and the larger area of radial velocity on 30 June. Small hails occurred in two processes caused by weak rotation, which is worth noting in forecasting. Two hail processes are related with the maximum reflectivity, cell top, VIL, and density of the storm, as well as the thickness, maximum shear, and duration of the mesocyclone.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.