【摘要】 从天气形势、物理量场特征、自动站逐时资料变化特征等入手,对2012-07-08—09临汾市局部暴雨天气过程进行分析,结果表明,此次降水过程是在西风槽东移,副高西进北抬的环流背景下产生的;700 hPa中尺度低压、低层辐合线和东路冷空气是该过程的主要触发系统;降水过程中边界层出现了明显的中尺度辅合线、切变线和低涡环流,短时强降水与小尺度的低涡环流相对应;物理量场上,降雨前期暴雨区有强的上升运动、较高的能量积累,层结不稳定,但低层辐合很弱,中低层湿度只在某层次上达到饱和。更多还原

【Abstract】 From the weather situation,the characteristics of physical quantity,automatic station hourly data variation characteristics of the Linfen city in the 2012-07-08—09 rainstorm weather process were analyzed,and the results show that the precipitation process is in the west wind trough eastward and subtropical high west north produced under the background of the circulation;The mesoscale low pressure 700hPa,low-level convergence line and east road cold air is the main trigger of the process system;Boundary layer in the process of precipitation appeared obvious mesoscale auxiliary line and shear line and the low vortex circulation,short-time strong rainfall with small scale corresponding to the low vortex circulation;Physical quantity field,rainfall rainstorm area has a strong upward movement,high energy accumulation,stratification is not stable,but lower convergence is very weak,only at a certain level in the lower humidity reaches saturation.更多还原