2020年2月14-16日本溪暴雪天气诊断分析

Diagnosis and Analysis of the Snowstorm from February 14 to 16,2020

基于地面高空观测资料、欧洲数值预报中心资料及NCEP 1°×1°每6 h再分析资料,分析2月14—16日暴雪过程的环流特征和物理量场。结果表明:低层辐合高层辐散的垂直结构是此次暴雪的主要原因,受高空急流、东北冷涡和强盛西南暖湿气流共同影响,在有利的动力、水汽、能量条件的共同作用下,配合较长的持续时间,辽宁省中东部地区出现了暴雪到大暴雪,局部出现特大暴雪。

The circulation characteristics and physical quantity field of the snowstorm from February 14 to 16 were analyzed based on the ground observation data,the European Center for Numerical Prediction and the NCEP 1°×1°reanalysis data every 6 hours.Results show that the low-level convergence and the high-level divergence of vertical structure is the main cause of the blizzard.It is affected by the upper-level jet stream,the northeast cold vortex and the strong southwest warm and wet airflow.Under the combined action of favorable dynamic,water vapor and energy conditions,with a longer duration.Therefore,the central and eastern areas of Liaoning Province produced a blizzard to a large blizzard,local heavy blizzard weather.