宁波机场一次强雷暴天气过程诊断分析

Diagnostic Analysis of a Severe Thunderstorm at Ningbo Airport

本文利用常规观测资料和NCEP/FNL再分析资料对2017年8月25日宁波机场的一次强雷暴天气过程进行诊断分析,结果表明:(1)中低层切变线和地面冷锋是影响此次雷暴的主要天气系统。(2)低空的辐合配合高空辐散为雷暴发生提供有利的动力条件。(3)大气层结的不稳定及低层不稳定能量输送为雷暴发生提供有利热力条件。(4)水汽分布具有下湿上干的垂直结构,水汽和上升运动区配合进一步加强不稳定能量的积聚。

This paper investigates and diagnostically analyzes the severe thunderstorm at Ningbo airport on August 25,2017 through conventional meteorological observation and NCEP/FNL reanalysis data.The results show that:(1)Low level shear line and the surface cold front are the main weather systems that affect the thunderstorm;(2)Lower convergence and upper divergence provide the thunderstorm favorable dynamic conditions;(3)Unstable atmospheric stratification and unstable energy transportation in the lower layers which provides favorable thermal conditions for the thunderstorm.(4)Water vapor distribution has a vertical structure with upper-layer dry and lower-layer wet,and water vapor cooperates with the ascending motion to further enhance the accumulation of unstable energy.