一次切变线暴雨的精细化分析

Fine Analysis on the Shear Line Heavy Rain

应用常规观测资料、NCEP FNL 1°×1°再分析资料,对切变线暴雨的落区进行精细化分析。结果表明,切变线的位置和锋面抬升的作用对暴雨落区的判断有重要作用;影响系统的空间结构及冷暖空气的相互作用对暴雨落区的精细化预报至关重要。当东北地区有冷空气从西北方向经陆路入侵时,切变线南侧的暖湿气流被锋面抬升至切变线附近,与冷空气交汇辐合,从而产生了暴雨。

Based on the conventional observational data and NCEP FNL1°×1°reanalysis data,the rainfall distribution of shear line heavy rain was refinedly analyzed.The results showed that,the interaction of the shear line and frontal uplift is important to the distribution of heavy rain.The spatial structure of affecting system and the interaction between cold and warm air are essential to the heavy rain fine forecast.When the Northeast cold air invaded from the northwest region,the warm air flow with shear line was lifted by the front,and met the cold air in the shear line,and then a heavy rain was produced.