摘要
Abstract
In this paper,EC reanalysis data ERA5(0.25°×0.25°),automated weather observing station data,Doppler weather radar data,radiosonde data and wind profile radar data are used to analyze the weather process of the initial thunderstorm that occurred at Nanning Wuwei International Airport on February 5,2023.The results show,the initial thunder weather process has the characteristics of early occurrence time and short duration,and the weather situation and weather reality before the thunderstorm are more consistent with the situation of continuous rainy weather in winter and spring,so it is easy to ignore the occurrence of thunderstorms.When the initial thunder weather process occurred,the near ground was controlled by cold air,and the thunderstorm developed above the near-ground inversion layer,which was a typical elevated thunderstorm.The continuous warm advection in the middle and low levels caused the increase of vertical temperature lapse rate,the strengthening of unstable stratification,and the sufficient water vapor and convergence in the middle and low levels were the main conditions for the generation of this elevated thunderstorm.The strong southwest warm and humid air in the middle and low layers superimposed on the near formation front and moved oblique upward along the front.The convergence caused by the strengthening of the low-level jet and the shear convergence at the height of 925 hPa provided the initial lifting conditions for the occurrence of the initial thunder,which may be the triggering mechanism for the formation of the convection.The maximum detection height of wind profiler radar,the sudden increase of low level jet stream index,the K index,SI index,θse850-θse500,T850-T500 and the revised CAPE value of convective parameters all have good indications for the forecast of this thunderstorm weather.关键词
初雷/高架雷暴/暖平流/低空急流/对流参数Key words
initial thunder/elevated thunderstorm/warm advection/low-level jet/convective parameter分类
航空航天
