青海互助一次局地强降水天气多普勒雷达回波分析

Analysis of Doppler-radar Data for a Local Severe Rainfall Weather Process in Huzhu County Qinghai Province

利用西宁CINRAD/CD多普勒天气雷达资料及自动站观测数据等从影响降水的主要因子方面探讨了2011年7月2日晚青海互助县一次局地强降水的成因,结果表明:多单体强回波带的活动是造成互助短时强降水的主要原因;速度图上强的辐合和逆风区是预报强降水的关键因子;垂直风廓线图上强烈的垂直风切变是不稳定能量积聚的表现,与强降水联系紧密;垂直累计液态含水量(VIL)和回波顶高也能为强降水预报提供有效信息。

The automatic station observation data and the CINRAD/CD Doppler radar data of Xining are used to analyze a local severe rainfall weather process during the night of July 2,2011 in Huzhu county,Haidong city,Qinghai province.It is found that the activity of multi-cell around the strong echo is the main reason to generate the shorttime strong rainfall in Huzhu county.Moreover,strong convergence and adverse wind area is the key point for strong rainfall forecasting.In addition,strong vertical wind shear in the vertical wind profile chart is an indication of the accumulation of unstable energy and so associated with the strong rainfall.Finally,the vertical accumulated liquid water content （VIL） and the echo top height could also provide useful information for strong rainfall forecasting.