深湿环境下一次飑线过程的预报着眼点分析

Forecast Focus Analysis of a Squall Line Process in Deep Humid Environment

通过对河南省一次深湿环境下的飑线过程的环流背景、探空和雷达回波特征进行分析,得到过程预报着眼点。深湿环境下,当中层有冷平流入侵,冷中心下方有暖脊发展,造成冷暖叠加且低层有较强风切变时,有利于强飑线的产生;初始阶段地形抬升对系统的发展、增强起重要作用,成熟阶段阵风锋抬升促进系统进一步增强;雷达风廓线产品中低层“ND”区与降水的开始和结束有较好的对应关系。

By analyzing the circulation background,sounding and radar echo characteristics of a squall line process in a deep wet environment in Henan Province,the focus of the process forecast is obtained:In deep wet environment,when cold advection intrusion in the middle layer,and there is a warm ridge below the cold center,it is conducive to the generation of strong squall lines when the cold and warm layers are superimposed and there is strong wind shear in the lower layers;the terrain uplift plays an important role in the development and enhancement of the system in the initial stage,the uplift of the gust front in mature stage promotes further enhancement of the system;Low-level"ND"area in Radar wind profile products has a good correspondence with the start and end of precipitation.