2019年2月20—21日三明市强对流天气过程分析

Analysis of Severe Convective Weather Process in Sanming from February 20 to 21,2019

利用常规气象观测资料、多普勒雷达资料对2019年2月20—21日福建省三明市强对流天气过程形成机制进行分析。结果表明,此次强对流天气过程以雷雨大风和冰雹为主,属于暖区降水,降雹类型为暖平流强迫型。西南急流为此次强对流过程提供水汽、不稳定能量,低层辐合系统对强对流触发和维持有重要指示作用。对流云团回波特征明显,出现钩状回波、“V”型缺口和三体散射长钉。此次风暴单体强质心位于0℃与-20℃高度,利于雹胚发展,但对大冰雹增长不利。

The formation mechanism of severe convective weather process in Sanming City of Fujian Province from February 20 to 21,2019 was analyzed by using conventional meteorological observation data and Doppler radar data.The results showed that the strong convective weather process was mainly thunderstorm,gale and hail,which belonged to warm precipitation,and the hail type was warm advection forced type.The southwest jet provided water vapor and unstable energy for the strong convection process,and the low level convergence system played an important role in triggering and maintaining the strong convection.The echo characteristics of convective clouds were obvious,such as hook echo,Vnotch and three body scatter spike.The strong centroid of the storm cell was at the height of 0℃and-20℃,which was beneficial to the development of hail embryo,but unfavorable to the growth of large hail.