东北冷涡中尺度天气的背景分析

THE BACKGROUND ANALYSIS STUDY OF MESO SCALE WEATHER OF THE COLD VORTEX IN NORTHEAST CHINA

通过大量的个例分析，统计得出东北冷涡造成中尺度天气系统和天气背景的条件，结论可供分析和预报东北冷涡产生强对流天气的可能性和落区时参考。

The cold vortex in northeast China is one of important synoptic system for local convenction.A mony plenty of case studies and by using statistical method,this paper finds out the basic weather conditions under which cold vortex made meso scale synoptic system and weather.This solusion can be used to analyse and predict the probability of cold vortex causing meso scale weather.According to these studies,local convections weather is found when cold vortex is strong.The weather is in north or west to norm wet tongue where θse>330K and steep gradient can be found.On upper level,there are polar front jet and subtropical jet strem which result in upper level divergence.On low level,there are low layer jet,strong moisture transfer and convergence steep vential wind sheer.All of these are necessary for causing meso scale synoptic system and weather.