2020年3月21日柯桥区强对流天气过程分析

文章利用气象自动观测站资料、NECP再分析资料和雷达图的综合分析,对2020年3月21日柯桥区出现强对流天气过程的大气环流和影响系统分析。结果表明:低空西南风急流为此次强对流天气提供了充足的水汽条件;3月21日白天的气温回升,假相当位温θse随锋面南压增大,增加了对流强加的不稳定性;切变线及地形抬升作用触发了强对流的发生。从雷达回波中可以得出,60dBZ强反射率因子,发生冰雹天气的概率较大。

Based on the comprehensive analysis of meteorological automatic observation station data, NECP reanalysis data and radar map, this paper analyzes the atmospheric circulation and influence system of severe convective weather process in Keqiao District on March 21, 2020. The results show that the low-level southwesterly jet provides sufficient water vapor conditions for the severe convective weather, and when the daytime temperature rises on March 21, the pseudo-equivalent temperature θse increases with the frontal south pressure, which increases the instability imposed by convection. The occurrence of strong convection is triggered by shear line and topographic uplift. From the radar echo, it can be concluded that the strong reflectivity factor of 60 dBZ has a high probability of hail weather.