银川河东机场一次锋面气旋型强雷雨天气过程总结分析

Summary and Analysis of the Weather Process of a Frontal Cyclone Type Strong Thun-derstorm at Yinchuan Hedong Airport

摘要: 本文利用MICAPS和NCEP再分析资料对2019年6月11日银川河东机场的一次强雷雨天气过程从天气实况、环流形势、物理量场条件等方面进行了分析。总结得出：低层河套地区低涡的活动、地面锋面的配合以及前倾槽的建立提供了河东机场正涡度、辐合和上升运动的基础，从而诱发了强对流天气；地面上蒙古国冷空气的南下为河东机场的强对流天气提供了触发条件，且冷空气受贺兰山阻挡以及冷空气的势力强弱影响着强对流触发的位置；地面锋面气旋中，冷空气和暖湿空气势力的强弱、冷暖锋的位置和移动决定了雷暴天气发生的位置和移动方向；低层华北地区高压底部的回流为银川河东机场强对流天气提供了暖湿气流的输送，有利于大气不稳定层结的建立。

Abstract: This article uses MICAPS and NCEP reanalysis data to analyze a strong thunderstorm weather pro-cess at Yinchuan Hedong Airport on June 11, 2019, including weather conditions, circulation pat-terns, and physical field conditions. The conclusion is that the activity of low vortices in the lower Hetao region, the coordination of surface fronts, and the establishment of forward tilting troughs provide the basis for positive vorticity, convergence, and upward motion at Hedong Airport, thereby inducing strong convective weather; the southward movement of Mongolian cold air on the ground provides triggering conditions for strong convective weather at Hedong Airport, and the cold air is obstructed by the Helan Mountains and the strength of the cold air affects the location of strong convective triggering; in surface frontal cyclones, the strength of the forces of cold and warm air and the position and movement of cold and warm fronts determine the location and direction of thun-derstorm occurrence; the reflux of the high-pressure bottom in the lower North China region provides warm and humid airflow for the strong convective weather at Yinchuan Hedong Airport, which is conducive to the establishment of unstable atmospheric stratification.