一次伴随冰雹大风的强降水天气特征分析

Analysis of a Heavy Precipitation Weather Feature Accompanied by Hail and Gale

2015年5月19日贵州省镇宁县出现了强风雹暴雨天气,该文利用常规观测资料、贵阳和兴义多普勒雷达资料、FNL再分析资料等,详细分析了本次过程的环流形势、环境条件、雷达回波特征等;结果表明:本次过程发生在南支槽稳定维持、中低层西南急流持续影响、高原低涡不断发展的天气背景下;适宜的0℃、-20℃层高度,上干下湿的水汽分布,较大的(T850-T500)差等导致了本次天气过程中冰雹和大风的发生;中低层持续的冷平流输送以及较高的垂直螺旋度使得对流单体发展和维持;强对流单体生消快,移动迅速,持续时间短造成了此次天气的局地性强。

Zhenning County of Guizhou province appeared strong hail storm weather in ingthe data of conventional observation, the data of Doppler radar from Guiyang and Xingyi May 19, 2015, By us- and the data of FNL1 ＊ 1 reanalysis , to detailed analysis of the circulation situation, environmental conditions and the characteristics of ra- dar echo . The results showed that： In webtisr stable low level southwest jet to maintain, the continuing impact of the plateau vortex development under the background of the weather , the suitable height for 0 ℃ and - 20 ℃ , the appropriate wet on the distribution of water vapor, the temperature difference in 850hPa to 500hPa is more condu- cive to hail and strong winds ;The main reason for convective development and maintenance is a continuous stream of cold advection transportation and the high vertical helicity; What mainly caused by these strong local weather are strong convective moving fast, rapid development, short duration, fast dissipation.