阿勒泰和伊犁地区一次寒潮、大到暴雪天气过程分析

Analysis on a Weather Process of Cold Wave, Heavy Snowstorm in Altay and Ili Regions

摘要: 利用常规高空、地面实况图和数值预报产品T639的资料，对阿勒泰地区和伊犁地区2010年1月15~20日出现的一次寒潮、大到暴雪天气过程进行综合分析，结果表明：黑海脊发展与欧洲脊同位相叠加东移并顺转,脊前东北风带建立并加强，槽南压西退，引导泰米尔半岛冷空气沿脊前东北气流西南下到西西伯利亚低槽中，使其斜压性增强，迫使槽转向强烈发展东南垮；使欧洲脊向东南衰退，促使西西伯利亚的冷空气大举南下，造成北疆地区的强寒潮和大到暴雪天气，对比分析两地区的形势场、地面场，及物理要素等，为预报新疆天气提供了一些参考依据。

Abstract: Based on the data of conventional upper and field and numerical forecast products of T639, a cold waves and snow storms weather happened from 15 to 20 January 2010 in Altay and Ili Regions, which is comprehensively inves-tigated. The results show that the ridge of the Black sea developed and moved to east with ridge of European, and the Northeast wind formed and strengthen in front of the ridge, then the trough moved to southward and westward. The northeast cold air in Taimyr Peninsula of the ridge was guided along the northeast air flow of ridge to the Siberia trough, which caused baroclinicity enhanced and forced the trough strongly developed and collapsed to southeast. The Euro-pean ridge collapsed to southeast too, which forced the cold air broke out southward in west Siberia and caused strong cold wave and heavy snowstorm in northern Xinjiang. A comparative analysis of forms field, surface filed and physical elements is made, which provided some reference for weather forecast in Xinjiang.