Mesoscale Characteristics of a Local Rainstorm on July 27 in the Southern Hebei Plain
In order to improve the understanding of the evolution of a short duration local rainstorm system and explore the characteristics and causes of short-time rainstorm,the mesoscale spatiotemporal evolution characteristics of a local heavy rainstorm on July 27,2019,in the southern Hebei plain were analyzed by using the observation from FY-4A meteorological satellite,weather radar remote sensing products,ground-based and sounding data.The results show that this process is a local heavy rainstorm generated by the upper-altitude trough and the low-level shear line on the periphery of the subtropical high.The convective organization in the rainstorm system shows an evolutionary process of"new development,merging and strengthening,maintenance,migration,and dissipation."The main causes of the heavy rainstorm in the southern Hebei plain include:Merging and strengthening of two early developing convective systems,the early stage of the peripheral convection provides an abundant water vapor environment,middle mesoscale vertical circulation structure with strong rotating and strong convergence in the lower and middle atmosphere;The convergence center in each layer space position is advantageous to the water supply and maintain efficient growth of the raindrop.The results provide a scientific reference for the near forecast and early warning of short-term severe convective weather in the southern Hebei plain.
southern Hebei plainshort duration rainstormmesoscaleevolution of convection
国家科技期刊平台
NSTL
万方数据
