2013年6月30日黑龙江南部飑线过程分析

Analysis of the squall line process occurred in the south of Heilongjiang province on June 30, 2013

本文对2013年6月30日黑龙江省南部的一次飑线过程进行了分析。该飑线影响范围大、持续时间长,成因较为特别。受其影响,黑龙江省南部地区多站发生短时强降水、雷电、大风等强对流天气。此次飑线过程在暖锋上触发,由两块对流云团逐渐发展加强合并而成。卫星云图上,可见两对流云团相遇并趋于合并,并在其间新生成出一条狭长的云带。多普勒雷达图像上,最强回波呈窄带状分布在对流系统出流边界的前沿,随着两对流系统逐渐靠近,其出流边界之间,不断有新的对流单体生成,有利于飑线的生成、加强和维持。另外,高空弱冷空气与低层暖湿空气的配合,地面暖锋及高低空急流的动力抬升作用,以及西南低空急流对暖湿空气的输送等都是此次飑线发生的有利条件。

A squall line process occurred in the south of Heilongjiang province on June 30, 2013 is analyzed. It is triggered on the warm front , and gradually strengthen and merge by two pieces of convective cloud cluster. It is visible on the satellite cloud pictures that two convective clouds meet and tend to be merged, and a new narrow band is generated between them. On the radar image, the strongest echo distributes in a narrow belt in the fore- front of the flow boundary of convection system. With the two convection system gradually closing, new convection cells are constantly generating between the flow boundary, and it is advantageous to strengthen and maintain of squall line. In addition, the high-level weak cold air cooperates with the low-level warm moist air, warm front on the ground and dynamic lifting effect of upper-level jet stream and low level jet , and the southwest 10w level jet transport moist air are aU advantage of the squall line occurring.