2014年1月28日伊犁河谷暴雪天气的诊断分析

Diagnostic Analysis of Snowstorm Occurred on 28 January 2014 in Yili Valley

摘要: 利用常规观测资料、NCEP资料以及多普勒雷达资料，对2014年1月28日伊犁地区特大暴雪进行分析。结果表明：暴雪过程与高空冷槽、南支暖湿气流以及中低空切变有着密切联系；高空偏西急流，加强了整层的上升运动，为强降雪的发生提供了有利的大尺度环流条件；长时间强的水汽输送为暴雪天气提供了充沛的水汽条件；低空辐合、高空辐散的高低空配置有利于暴雪的出现。

Abstract: By using conventional meteorological observational data and Necp data and Doppler radar data, a heavy snow process on January 28, 2014 in Yili region was diagnosed. It is concluded that the storm is in a stable atmospheric circulation background. The results indicate that the heavy snow process is related to high altitude cold trough, warm moist air flows south branch and shear in the middle and lower level. High altitude by west rapids strengthened the upward movement of the whole layer and provided the favorable large scale circulation condition for the happening of the heavy snow. Long time strong water vapor transport for blizzard weather provides abundant water vapor conditions. Low-level convergence and upper divergence of empty configuration is advantageous to the blizzard.