山西省2011年11月28-29日暴雪天气过程诊断分析

为了深入研究山西产生暴雪天气过程的环流背景、影响系统及在强降雪期间物理量场空间结构的有利配置，针对2011年11月28-29日山西区域性暴雪天气过程，从500 hPa环流背景、中低层影响系统的相互配置、fy-2c红外卫星云图的演变特征、物理量场（垂直速度、散度、相对湿度）的空间垂直剖面进行了综合分析。结果表明：该次暴雪天气过程是在500 hPa西风槽、700 hPa切变与850 hPa持续偏东风的共同作用下形成，700 hPa切变与fy-2c云图上云团的演变过程息息相关，尤其位相变化一致，构成了暴雪产生的直接影响系统，强烈的上升运动，深厚湿层、上散下合流畅配置构成了强降雪产生的有利条件。该次暴雪天气过程的综合分析研究，给出了今后暴雪预报具有指导性意义的参考信息。

Diagnostic Analysis of Snowstorm in Shanxi Province in November 28-29, 2011

In order to research the circulation background and influence system which brought about the snowstorm process and the favorable configuration of physical space structure during the strong snowfall in Shanxi,so the snowstorm,which occurred on November 28-29,2011,was analyzed from the 500 hPa circulation background,the altitude system disposition,the mutual configuration of middle-lower system influence,the evolution of the fy-2c satellite cloud picture,the spatial vertical section of physical quantity field（vertical velocity,divergence,relative humidity）.The result showed that the storm weather was formed in the 500 hPa west wind trough,700 hPa shear and 850 hPa easterly wind continued,700 hPa shear was closely related with the evolution process of fy-2c cloud pictures,especially a phase change was consistent,they were the directly affect system of snowstorm.The strong rise movement,deep wet layer and the smooth allocation of upper radiation and lower convergence formed the snowstorm favorable conditions.This research of snowstorm weather process would give an instructive reference information of snowstorm forecast in the future.