摘要
强对流天气常常出现在锋前不稳定层结区或锋面附近,对于锋后的强对流天气往往容易出现漏报现象。利用常规观测资料、雷达卫星资料,对贵州中东部地区2009-02-26夜间出现的锋后冰雹天气形成机制进行分析。结果表明,该次过程主要是由于冷空气势力加厚增强抬升中层相对较暖空气,造成中层出现对流不稳定,加上低空急流脉动效应与其最大风速中心前的辐合上升运动共同影响,引发对流的产生和发展。强的垂直风切变对强对流发展与维持也起到促进作用。
Severe convective weather often occurs in the unstable stratification zone before a front for the severe convective weather phenomena after a front are often prone to failing to forecast. In or near a front, this paper, conventional observation data, radar and satellite data are used to analysis formation mechanism for the hail occurred in the eastern part of Guizhou Province during the night on February 26, 2009. The results show that this process was mainly due to thickening of the cold air forced to enhance the uplift of the middle - level relatively warmer air, resuiting in middle - level convective instability occurred, coupled with low - level jet pulse and convergence and upward motion before the maximum wind speed center, triggering emergence and development of the convection, and strong vertical wind shear on convective development and maintenance also played a catalytic rele.
出处
《贵州气象》
2010年第1期8-12,共5页
Journal of Guizhou Meteorology
关键词
锋后强对流
冰雹
低空急流
脉动
severe
convection
hail
low - level
jet
pulse
