Climatic characteristics of mesoscale convective systems in the warm season in North China

Abstract In this study, a total of 339 mesoscale convective systems (MCSs) are obtained in North China using the temperature brightness blackbody (TBB) data from FY-2E warm season 2010 to 2018. The number meso-α-scale (MαCSs) is much more than that meso-β-scale (MβCSs). elongated (MECSs) circular (MCCSs). Most MCSs occur July and August, which have widest influence range, longest duration, strongest convection. MαCS develops slowly weakens rapidly. diurnal variation MαCSs presents bimodal distribution, most form afternoon, while some evening. activities concentrated two belts, namely, east–west-oriented belt along Henan Province, Shandong Province Yellow Sea, south–north-oriented central-western Shandong, Tianjin City, west Bohai Sea northeast Hebei Province. mainly move eastward, only MECSs southwestward northwestward. easterly northerly moving affected by steering flow, southerly storm propagation. high temperature, humidity energy area, with favorable dynamic conditions, such as middle-level trough or vortex, low-level shear line, surface inverted convergence terrain. Meanwhile, MCS pregnant environment often accompanied jet relatively strong vertical wind shear.