Through the comprehensive analysis of the high and low altitude situation, the ground situation and the numerical forecasting products, a middle - large snow and local blizzard weather process in Huludao from the evening of February 12th, 2009 to the morning of the next day was systematically analyzed by using the references of convention observation, mathematical forecast, satellite cloud picture and so on. The results showed that the beneficial coordination of high and low altitude and intersection of cold and warm air were the key factors of this synoptic process. It was the main reason of the early rain and late snowing that the earlier period was dominated by the warm and wet air, and the later period was controlled by the dry and cold air.%利用常规观测、数值预报、卫星云图等资料,通过对高低空形势、地面形势和多家数值预报产品的综合分析,对辽宁省葫芦岛市2009年2月12日傍晚～13日清晨中到大雪、局地暴雪的天气过程进行了系统分析.结果表明,高低空的有利配合,冷暖空气的交汇,是形成这次天气过程的关键.前期受暖湿空气主导,后期受干冷空气控制,这是先降雨后降雪的主要原因.
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