昆明长水机场两次静止锋雷暴过程对比和保障难点分析

Comparative Analysis and Operational Challenges of Two Stationary Front Thunderstorm Events at Kunming

运用常规探空观测资料、风廓线雷达和多普勒雷达资料对2019年8月13-14日和2020年6月13-14日两次典型的静止锋雷暴天气和保障过程进行对比分析。两次天气均是昆明准静止锋配合500hPa槽后西北气流和700hPa切变线南压的过程,不同之处在于2019年8月13-14日700hPa本场处于滇中槽前,而2020年6月13-14日位于西太平洋副高西南侧东南气流控制。二者的区别也造成了航班影响状况的不同,前者是锋面从东北面过境先后造成本场和五边延长线雷雨,后者是锋面迅速过境后首先造成五边延长线长时间雷雨覆盖,然后随着锋面的北退才造成本场雷雨,与前者影响顺序正好相反,且两次过程主要影响的时段都是每日0-2点的回港小高峰。

Based on the conventional observation data,wind profile radar data and Doppler radar data,the two typical stationary front thunderstorm events on August 13-14,2019 and June 13-14,2020 are compared and analyzed.The two weather processes are the northwest air flow behind the 500 hPa trough and the south pressure of the 700 HPA shear line.The difference is that the 700hPa field on August 13-14,2019 is in front of the central Yunnan trough and on the process of June 13-14,2020,the southeast air flow is controlled by the southwest side of the Western Pacific subtropical high.The difference between the two also leads to different flight impact.For the first time,the front passed through the northeast,causing the thunderstorm in this field and the extended line of the final successively.The second is that after the passing of the front,the extended line of the final was covered by thunderstorms for a long time,and then with the northward movement of the front,and the thunderstorm was caused.The two main influence periods are the small peak of night shift from O to 2 o'clock.Wind profile radar data can play an important role in the decision-making of the advance and retreat auxiliary forecast of the judgement system.