雷达回波区REA ？
强雷达回波和正负速度对、逆风区等特征对强降水具有指示意义。
Strong radar echoes and positive-negative velocity and head wind area are indicative to the heavy rainfall event.
应用闪电位置和强度资料与雷达回波图象相叠加，发现闪电出现频繁的区域，正好对应于雷达强回波区。
Put the lightnings' place and the intensity data on top of the radar echoes picture, it is found that the place where lightnings appear frequently is just the place where the radar echoes are strong.
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