准噶尔盆地西北缘一次大到暴雨天气过程分析

通过分析2010年6月28-29日发生在准噶尔盆地西北缘的一次大到暴雨天气，揭示了形成这次强降水天气的环流背景特点、物理量和雷达回波特征。结果显示：冷暖气团在克拉玛依地区附近相遇产生的中尺度锋生现象触发了本次暴雨天气过程。表现最明显的特征是：高空槽移动缓慢，中层切变线不断南压、低层中尺度系统维持，冷暖气团在该区域强烈交汇。暴雨区雷达速度场有明显的风场幅合。对流降水云团强度、移向变化的预测，是此类天气临近预报的关键和难点。

Analysis on the Weather Process of a Heavy-Hard Rainfall in the Northwestern Margin of Junggar Basin

This paper Analyzed the heavy-hard rainfall in the northwestern margin of Junggar basin during 28-29 June 2010,evealed the formation of the circulation background characteristics of strong precipitation, physical quantities and radar echo features. The results showed that： In Karamay region near the cold and warm air mass meet to produce the mesoscale frontogenesis phenomenon to triggered the rainstorm weather process. The most obvious feature is：the low through of upper air moving slowly,The shear line of middle level pressed to south continuously,lower level mesoscale system to maintain,between warm and cool air come into violent interaction effect in the region. the area of rainstorm have obvious wind convergence zone in the velocity field of radar.To predict the changes of intensity and moving directions of the convective rain clouds,is the key and difficulty of the short term forecasting and nowcasting.