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中文摘要：
在冬季风暴各种降水类型中,冻雨的预报是其中最有难度,也最具挑战的一种.贵州湖南冻雨是在对流层高、中、低层各纬度天气系统相互作用下形成的,其中最直接和主要的影响系统有：高层的副热带高空急流锋区、低层的云贵准静止锋以及中低层的西南低空急流.在这种复杂的天气背景下,为了准确地分析并预报出冻雨的发生区域,在仔细分析研究冻雨发生的大气背景和天气特点后,我们探索性地提出一套冻雨的诊断预测方法,即“动力因子”和“三步判别法”相结合的方法.同时,我们把该方法应用到中国冻雨最为频发的贵州地区,首先利用动力因子垂直积分的斜压涡度参数（qBsum）找到未来因斜压性较强而易发生弱降水的区域,再结合预报场的单站探空资料,进行三步判断方法,就能比较全面地判断冻雨发生的区域,对冻雨进行准确预报.
英文摘要：
During the winter storm, freezing rain is one of the most difficult to forecast among the various types of precipitation. The freezing rain over Guizhou and Hunan provinces is formed because of the interaction between the mid-higher latitude and the lower-latitude weather systems. The most important weather systems are the high-level subtropical jet stream front, the lower-level Yunnan-Guizhou quasi-stationary front, and the southwesterly jet. To accurately analyze the occurrence of freezing rain under these complex weather systems, we have proposed a new set of diagnostic method, which is a combination of the ＂dynamical factor＂ and the ＂three-step judge method.＂ Meanwhile, we have applied the method to forecast freezing rain in Guizhou Province, China, where freezing rain occurs most frequently.We first used the dynamical factor vertical integral baroclinic vorticity parameter （qBsum） to find the possible weak rainfall region owing to atmospheric baroclinity, and then used single-station radiosonde data to employ the following three-step judge method. Finally, we determined the regions where freezing rain may occur in the future.
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