桂林市一次强对流天气过程诊断分析

Diagnosis and Analysis on a Severe Convection Weather in Guilin City

利用常规气象观测和加密自动站资料以及卫星多普勒雷达资料,对2015年4月20日桂林强对流过程进行诊断分析。结果表明:此次过程是由MCS造成的以短时暴雨为主的复合型强对流,双逆温层条件下由辐射加热和西南暖湿急流存储的巨大不稳定能量,主要由低空强辐合和大振幅高空槽触发抬升,高层强辐散进一步加强了气流上升,合适的环境条件还造成了大风和冰雹天气;此外,使用V-3θ图更易发现和预报此次过程。

Based on data of conventional meteorological observation, encrypted automatic station, satellite and Doppler radar, a severe convection weather process occurred on April 20,2015 in Guilin was diagnosed and studied. The results showed that this process was a composite severe convection caused by MCS, which was dominated by short-term rainstorms. A large amount of unstable energy stored by radiation heating and southwest warm and wet jet stream under the condition of double inversion layer was mainly triggered by low space strong convergence and large amplitude high slot. Upper-level severe divergence further enhanced air stream uplift. The right conditions also resulted in high winds and hail. In addition, V-3θ diagram were made to facilitate the discovery and prediction of the process.