The purpose of this study is to examine the influences of mesoscale thermal and dynamical processes near land‐sea boundary on the formation and development of a squall line across the Hangzhou Bay (HZB) of East China Sea that resulted in strong surface winds and heavy rainfall. High‐resolution spatiotemporal analyses obtained from Variational Doppler Radar Analysis System via the assimilation of radar and surface observations are used for this study. We focus on meso‐scale factors leading to the initiation of the squall line and the development of a bow echo that caused damaging winds and heavy rainfall. It was found that a local‐scale sea breeze associated with the distinct coastline curvature of the HZB was pivotal to the formation of the squall line. The convective initiation occurred near the HZB's western coastline when the leading edge of the northeasterly sea breeze was met by a westerly outflow from a previous precipitation system to the west of HZB. After the formation of the squall line, a rear inflow jet descending from mid‐level to surface contributed to the formation of the bow echo and resulted in damaging local winds.

中文翻译：

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穿越杭州湾的Squ线的启动与发展

这项研究的目的是研究陆海边界附近的中尺度热力和动力过程对东海杭州湾横渡qua线的形成和发展的影响，that线引起了强烈的地面风和强降雨。本研究使用从变分多普勒雷达分析系统通过雷达和地面观测的同化获得的高分辨率时空分析。我们关注中尺度因素，这些因素导致行的爆发和弓形回波的发展，这些弓形回波造成了有害的风和强降雨。发现与HZB独特的海岸线曲率相关的局部尺度的海风对线的形成至关重要。对流引发发生在HZB'附近 东北海风的前缘被从先前的降水系统向西边带的西边流出的西风汇合时，位于西海岸。s线形成后，从中高度下降到地面的后部入流射流有助于形成船首回波并造成局部风的破坏。