黔北一次低涡切变系统单多普勒雷达资料分析

利用遵义CINRAD/CD多普勒雷达资料并结合其他资料分析了2008年7月10日发生在黔北地区的冰雹大风、短时强降水天气。结果表明,该系统是低涡切变带有冷空气南压过境影响所致;回波单体初期发展沿切变线排列,并在发展剧烈的回波所在处产生冰雹天气;降雹前出现最强回波60～65dbz,降雹时低仰角回波强度跃增到55～60dbz,回波高度11～15km,VIL值〉35kg/m2;回波分布有涡旋带状特征,当涡旋中心移向原有回波时,回波剧烈增强,产生持久深厚的辐合中气旋,地面出现冰雹大风;仁怀北部乡镇降雹和短时强降水可能与此区域左倒U型地形有关;湄潭永兴和鱼泉、仁怀学孔和喜头的回波是超级单体回波,其余各地降雹回波为多单体强回波。

Doppler Radar Data Analysis on A Low-shear Vortex System in Northern Guizhou

By using Zunyi CINRAD/CD Doppler radar data and in combination with other data,a hail strong wind,heavy rainfall in short time occurred on July 10,2008 in the north Guizhou Province was analyzed. The analysis showed that the system is low-shear vortex with a cold air presses to south affected by the transit influence; echo developed in the early monomer arranged along the shear line,and in the development of echo location in generated intense hail weather; before the hail shooting,the strongest echoes value...