2007年8月沈阳地区一次雷雨大风冰雹天气的多普勒雷达资料分析

摘要

By using CINRAD/SA Doppler radar data and micaps conventional data in Shenyang, a local heavy rainstorm weather process occurred from August 8 to 9, 2007 in Shenyang has been analyzed. The results show that the main impact system are cold trough on 500 hPa, low eddy shear line on 850 hPa, lower troposphere jet in the southwest and surface cold front. The lifting of surface cold front is very important to trigger off the severe convective storm. The squall line appeared in southwest of the low eddy and occurred in the warm section of surface cold front. Bow echo occurs is usually accompanied by ground winds. VIL big value area and the axon VIL thickening phenomenon can be instructed to short-term rainstorm and appearance of hail.%利用沈阳CINRAD/SA多普勒天气雷达观测资料及micaps常规资料,对2007年8月8～9日发生在沈阳的雷雨大风冰雹天气进行分析.结果表明:2007年8月8～9日的沈阳地区雷雨大风冰雹天气主要影响系统是500 hPa冷槽、850 hPa低涡切变线、西南低空急流以及地面冷锋.地面冷锋的抬升作用是该次强对流天气的触发机制；飑线出现在冷涡的西南方；与地面锋面活动有关,发生在地面冷锋前的暖区内.弓形回波发生时通常伴随着地面大风,垂直累积液态水含量(VIL)的大值区和VIL的突增现象可以指示短时暴雨、冰雹的出现.