2016年11月21-22日三门峡市大暴雪天气过程分析

摘要

Based on the data of high altitude ground observation,European numerical forecast and CINRAD /SB Doppler weather radar,the formation mechanism and process characteristics of the heavy snowstorm process in Sanmenxia City in November 21-20,2016 were analyzed.The results showed that the 500 hPa low trough,700 hPa low trough shear line and ground strong cold air were favorable weather conditions for the occurrence of heavy snowstorm in Sanmenxia City.Warm and humid air flow in November was relatively strong,the liquid water content in the snow was more,which was prone to snowstorm or heavy snowstorm.Radar data showed that the maintenance of a steady stream of 30 dBz strong echo and "train effect" was an important reason for the occurrence of heavy snowstorm.In November,Sanmenxia City appeared thunder phenomenon when the radar echo top reached 11 km,which was extremely rare in winter.%利用高空地面观测资料、欧洲数值预报,结合CINRAD/SB多普勒天气雷达产品,对2016年11月21-22日发生在三门峡市的大暴雪天气过程的形成机制和过程特征进行了总结分析,结果表明:500 hPa低槽、700 hPa低槽带切变线配合地面强冷空气是产生三门峡市大暴雪天气的有利天气形势配置;11月份暖湿气流比较强盛,雪中的液态水含量较多,易出现暴雪或大暴雪.雷达资料显示,源源不断的30 dBz强回波的维持以及"列车效应"是产生大暴雪的重要原因.11月份,当雷达回波顶高达到 11 km时,三门峡市出现打雷现象,这是冬季极其少见的.