2020年8月18日—19日沈阳地区暴雨天气过程分析

Analysis of the Process of Heavy Rain in Shenyang from August 18 to 19,2020

利用实况观测资料、欧洲中期天气预报中心细网格预报产品和多普勒雷达探测产品,针对2020年8月18日—19日沈阳地区一次暴雨天气过程进行了分析,结果表明:此次暴雨过程共分为2个阶段,第1阶段为副热带高压外围的对流性降水,其中水汽和热力条件均满足辽宁暴雨预报的阈值,且存在一定的垂直风切变,降水量达到大到暴雨、局部大暴雨;第2阶段为冷锋产生的稳定性降水,系统性辐合抬升作用明显,但水汽和热力条件不足,降水量仅达到中到大雨。

This article uses live observation data,European Centre for Medium-Range Weather Forecasts(ECMWF)fine-grid forecast products and doppler radar detection products for the Shenyang area from August 18 to 19,2020.The analysis of a rainstorm weather process showed that the rainstorm process was divided into two stages.The first stage was convective precipitation outside the subtropical high.The water vapor and thermal conditions met the threshold of Liaoning rainstorm forecast,and there were certain In the second stage,the stable precipitation produced by the cold front,the systematic convergence and uplifting effect is obvious,but the water vapor and thermal conditions are insufficient,and the precipitation only reaches moderate to heavy rain.