Abstract:

Based on routine meteorological data，CINRAD/CC Doppler radar data and numerical model，a severe hail weather process
occurred in Maigaiti area of western Talimu basin in southern Xinjiang on 17 June，2011 was analyzed． The results show that the hail
weather was triggered by the beneficial vertical atmospheric circulation pattern and the unstable atmosphere stratification． The typical
echo characteristics of hail cloud，such as hook echoes，weak echo regions，suspended echoes and mesocyclones，were significant on
the radar chart，which may be regarded as an indicator for hailstorm forecasting． In addition，the numerical simulation show that the
hail cloud had the vertical structure with convergence at the low level，a pair of vortex at the middle level，and divergence at the upper
level． The space allocation was in favor of the developing and maintaining of hail clouds．

Key words: severe hail, circulation pattern, vault echoes, mesoscale vortex, numerical simulation

摘要：

利用常规气象资料和 CINRAD/CC 新一代天气雷达资料以及对流云数值模式等，对 2011 年 6月 17 日发生在南疆塔里木盆地西部麦盖提垦区的一次强冰雹天气过程进行了分析。结果表明:大气不稳定层结的存在和有利的高低空环流形势配置的动力作用，是触发这次南疆西部局地强对流天气产生降雹的主要原因。在冰雹天气发展过程中，探测到了如钩状回波、弱回波区、悬挂回波和中气旋等典型的冰雹云回波特征，这对冰雹天气邻近预报具有一定指示意义。数值模拟结果显示，冰雹云具有低层辐合、中层有一对涡旋、高层辐散的结构特征，这种结构有利于冰雹云的发展和维持。

关键词: 强冰雹, 环流形势, 穹窿回波, 中气旋, 数值模拟