2015年7月16日和政县冰雹成因分析

Cause Analysis on Hail of Hezheng County on July 16,2015

利用常规观测资料、NCEP、和政县自动站观测实况、卫星云图、雷达拼图结合和政地区的地形特点对2015年7月16日18:30发生在和政地区的冰雹天气进行分析。研究结果表明:和政县是甘肃省临夏州冰雹多发地带,出现冰雹天气的月变化特征明显主要集中在7—8月,其中7月下旬至8月上旬最多。主要天气类型可以分为3类:冷涡型、低槽型及偏西气流型。从大尺度形势特征来看,和政地区冰雹日各层均有动力辐合系统,并且整层系统配置近似垂直或略前倾。冰雹天气的发生并不需要较强的湿度条件,地面风场、0℃层高度、-20℃层高度、850 h Pa与500 h Pa温差等对冰雹天气发生有着较好的指示意义。

Hail weather was analyzed by using conventional observation data and NCEP, Hezheng Automatic Station Observation of live, satellite cloud picture, radar puzzle in combination with the features of the terrain and administration in 18 ： 30 on July 16,2015 in Hczheng County. The results showed that：variation characteristics of hail weather month clearly focused on July and August, which in late July and early August is the most frequent hail zone in Hezheng County of Gansu Province. Cold eddy type ,low trough type and by west airflow type which was a major type of hail weather.Hail days in each layer are dynamic convergence system and administration area, system configuration and the whole layer approximately vertical or slightly forward from the point of large scale situation characteristic. The occurrence of hail weather doesn＇t need strong humidity conditions, but the ground wind field,0 ℃ level height,-20 % level height,850 hPa and 500 hPa temperature difference and so on in the hail weather had good instruction significance.