中文摘要：

着重分析了VDRAS要素在奥运会期间对流天气形成过程中的演变特征。典型对流天气个例分析表明，阵风锋之间的碰撞对雷暴天气的形成具有指示意义，其中VDRAS强梯度的存在能够预示将要分离出阵风锋；冷中心的加强意味着降水还将发展，减弱意味着降水要减弱。应用风廓线和自动气象站资料对VDRAS的信息做检验，表明在0．18～1．6km高度上风向基本一致，但是风速有时偏小2m／s；1．6～2．8km高度上，风向和风速大体一致；2．8～3．5km高度上，风向基本一致，但风速有时偏小2m／s。VDRAS气温高于地面自动站的气温约3～4℃。

英文摘要：

The features of VDRAS products at the initial stage of thunderstorms during the 2008 Olympic Games are analyzed. It is concluded that collision among gust fronts can cause thunderstorms. The strong temperature gradients of VDRAS mean that a gust front will be separated from its major cell. Meanwhile, the intensified cold center means that the thunderstorm will develop. The VDRAS products are verified by means of the wind profile and AWS （Automatic Weather Station） data from Haidian. The results indicate that the wind direction of VDRAS from 0.18 to 1.6 km of height were the same as the profile, but the wind speed was smaller. Wind direction and wind speed from 1.6 to 2.8 km were the same as the profile. The wind direction of VDRAS from 2.8 to 3.5 km was also the same as the profile, but the speed was sometime smaller. In addition, the temperature of VDRAS was about 3 to 4 ℃ higher than that of AWS.