滇西冰雹与短时强降水的多普勒雷达产品的对比分析

A Comparative Analysis of Doppler Radar Products for Hailstone and Short-term Heavy Rainstorm in West Yunnan Province

为发挥多普勒天气雷达监测和预警冰雹、雷雨大风、短时强降水等强对流天气的作用,制作出精细化的临近和短时预报,选取了滇西7次典型的强对流天气过程,从五个方面对冰雹和短时强降水两类强对流天气的多普勒天气雷达回波特征进行对比分析。结果表明:冰雹云回波基本径向速度场上出现了辐合、逆风区等特征,短时强降水也会出现逆风区特征,冰雹天气中的风切变明显大于短时强降水的;滇西冰雹过程45-55 d BZ强回波平均高度为7.4 km,比短时强降水回波高3 km。冰雹天气的回波顶高明显高于短时强降水。降雹前VIL值会不同程度地持续跃增,降雹时VIL值明显大于短时强降水的。

In order to give play to the role of radar on monitoring and alerting hailstone, thunderstorm, short-term heavy rain-storm and other strong convective weather, provide near and short term weather forecast, this paper selects 7 typical strong convective weather processes in west Yunnan Province, and conducts comparative study on the Doppler radar return from 5 perspectives. Research result show that the hailstone radar return shows convergence and upwind in its basic radial velocity field, the short-term heavy rainstorm also shows upwind, the wind shear of hailstone is obviously stronger than that of short-term heavy rainstorm; the average height of hailstone 45-55 dBZ radar return is 7.4 km, 3 km higher than that of the short-term heavy rainstorm in west Yunnan Province. The VIL value before hailstone continues to jump, and the VIL during hailstone is obviously stronger than that of the short-term heavy rainstorm.