一场初冬“雷打雪”天气的中尺度特征分析

Analysis of "Thunder in Snow" Weather Process With Mesoscale Characteristic in Early Winter

利用探空资料、T639数值预报产品和多普勒天气雷达资料,对2009年11月郑州地区的一场"雷打雪"天气过程进行了中尺度特征分析,结果表明:大尺度环流背景为暴雪的产生提供了有利条件,而中尺度露点锋是"雷打雪"天气发生的直接影响系统,中低层强烈的逆温层和"上干中湿下冷"的大气垂直结构为对流天气的产生储备了充足的不稳定能量,干暖盖指数对冬季对流天气的发生有一定的预报指示意义;多普勒天气雷达的径向速度产品是制作"雷打雪"天气短时临近预报的重要依据。

Using sounding data,numerical prediction product of T639 and Doppler weather radar data,the ＂thunder in snow＂ weather process in 2009 November in Zhengzhou was analyzed with mesoscale characteristic.The results indicate that： large scale circulation background for blizzard provides the favorable conditions;the mesoscale dew point is the directly influence system.The strong inversion layer and the vertical structure with ＂dry top moisture middle cold bottom＂ reserves enough unstable energy for the convective weather;the index with dry warm cover has forecast instructions for convective weather in winter.Radial velocity products of Doppler weather radar are the important basis for short-term forecast.