河南省一次大范围暴雪过程诊断分析

应用NECP1°×1°再分析资料和常规观测资料,对2009年11月10～12日河南省出现的大范围暴雪天气过程进行了诊断分析。结果表明：高空横槽断裂使东西两段先后转竖,引导冷空气南下与低空切变线的配合是形成此次暴雪的主要原因;偏南急流为暴雪提供了充沛的水汽和能量,是暴雪产生的必要条件;湿位涡的负大值区的分布对暴雪落区有很好的指示意义;强烈的上升运动的出现及加强与暴雪的发生和发展有较好的对应,是出现暴雪的动力条件;在广泛的15～25dBz的回波区内一波又一波地不断出现30dBz以上的对流单体,导致了此次暴雪过程的产生;回波伸展到很高的仰角之上,强回波中心位于中上层。

Analysis on A Large-scale Blizzard Process in Henan Province

By using NECP 1 °× 1 ° reanalysis data and conventional data,a large-scale blizzard process in Henan Province during Nov.10th-12th,2009 was analyzed. The results showed that upper transverse fracture groove make the two things have to switch vertical guide low-level cold air southward and with the shear line is the main reason for the formation of the Blizzard; southerly jet stream for the blizzard offers abundant moisture and energy,are necessary conditions for Blizzard created. MPV negative big value of the distribution of the heavy snow fall area has a good sense of direction. The emergence of a strong upward motion and strengthen the occurrence and development of Blizzard correspond well,is the driving force appers Blizzard conditions. To the snowstorm,in the range of 15-25 dBz echo waves of the region emerging 30dBz more convective cells,resulting in the production process of the Blizzard. Echo extended to a high elevation above the echo center is located in the upper.