Trough analyzing a strong hail process under atmospheric circulation background in Qingcheng County and Xifeng new generation weather radar echo material in south of Hetao on July 24, 2007, the results showed that Hetao low vortex the correspondence has the deep vorticity field distribution in the plumb section. Under theHe tao low vortex influence the strong hail new generation of weather radar monitor early waming target model: In front of the hail shooting the intensity R≥57 dBz also along with highly has the leap increases the characteristic, radial velocity V echo cyclone M and ≥ ± 20 m/s the speed center to in 2 - 11 km on highly active, cloud top highly ET remarkable, vertical liquid water content VIL≥45 kg/m2 great value center area rapid expansion.%通过对2007年7月24日河套南部庆城县强冰雹过程的大气环流背景和西峰新一代天气雷达回波资料分析,探讨此次低涡强冰雹的新一代雷达回波特征.结果表明,河套低涡在铅直剖面上对应有深厚的正涡度场分布;提出河套低涡影响下大冰雹的新一代天气雷达监测预警指标模型:降雹前强度R≥57 dBz且随高度有"跃增"特征,径向速度V回波的中气旋肘和≥±20 m/s的速度中心在2～11 km高度上活跃,云顶高度ET"跃升"显著,垂直液态水含量VIL≥45 kg/m<'2>大值中心面积迅速扩大,对有效实施人影防雹增雨作业,具有一定的指导意义.
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