利用T_（42）资料对北京大降水的诊断分析

The Application of T_(42) Products to the Diagnosis of Heavy Rainfall in Beijing

采用平滑滤波的方法，对Ｔ（４２）实况资料和２４小时预报场资料进行尺度分离，从分离出的扰动场中显示出原始场中没有的次天气尺度特征，为大降水预报提供依据。

The space filtering is applied to separate forecasting field of 24h T42 products. The rnesoscalefeatures appear clearly in disturbance field,which couldn't be found in initial forecasting field (T42products). This mesoscale features is good for the prediction of heavy rainfall events in Beijing.