贵阳市一次大范围冰雹天气过程综合分析

Comprehensive Analysis of a Large-scale Hailstorm Process in Guiyang

利用国家气象站常规观测资料和地面加密气象观测资料、多普勒天气雷达产品、FY-2D卫星云图、ERA5逐小时再分析资料对2021年5月9日贵阳市一次大范围冰雹天气过程进行综合分析。结果表明:对流在850 hPa切变线南侧、急流前侧以及地面辐合线附近触发,强对流沿地面辐合线不断东南移影响贵阳。强对流发生时,贵阳上空有强上升气流和明显的高层辐散、中低层辐合的结构。逆温层、700 hPa暖脊、热低压使得不稳定度增强,贵阳地区强雷暴发生概率增加。回波具有典型的冰雹回波特征。冰雹天气主要出现在TBB梯度大值区和TBB大值区之间。

A comprehensive analysis of a widespread hail weather process in Guiyang City on May 9,2021,is carried out utilizing conventional observations from national meteorological stations and ground-based encrypted meteorological observations,Doppler weather radar products,FY-2D satellite cloud maps,and ERA5 hour-byhour reanalysis data.The results indicated that the convection was triggered on the south side of the 850 hPa shear line,on the front side of the rapid and near the ground convergence line,and the strong convection kept moving southeastward along the ground convergence line to affect Guiyang.There were strong updrafts and an obvious structure of upper-level divergence and mid-and lowlevel convergence over Guiyang during the hailfall period.The thermal inversion layer,700 hPa warm ridge and thermal depression increased the unstable energy concentration and the probability of strong thunderstorms in the Guiyang area.The echoes had typical hail echo characteristics.Hailstorms mainly occur in the area of large TBB gradient and between the area of large TBB values.