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中文摘要：
运用多普勒雷达的径向速度资料，采用极坐标散度差分公式计算对流回波单体的径向散度值，利用回波辐合总量及辐合中心值与反射率因子、垂直累积液态含水量及中心值进行对比分析。结果表明：回波的强中心与低层径向辐合中心对应；低层径向辐合有利于回波维持或加强；径向辐合中心值的变化对未来回波强度变化有一定的指示意义，对于强对流回波的指示意义更为明显。经过对两次冰雹天气过程的应用检验，结果证明，低层径向辐合对强对流灾害性天气的临近预报有一定的指导作用。
英文摘要：
By means of new generation Doppler weather radar radial velocity products and divergence difference formula in polar coordinates, the value of cloud-echos＇ divergence are calculated. The result indicate that the strong center of echos are corresponding with convergence center in low level, it is benefit that echos maintain or strengthen while radial convergence in low level; the value of convergence center as well as its change rate are effective to forecast the variational trend of echos, especially to convectional, which have more obvious indications. Based on two hail weather process, the investigation suggest that the radial convergence in low level is useful to the nowcasting of strong convectional disaster weather.
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