阿拉山口市2017年“5•16”强降水、大风天气浅析

Analysis on the “May 16” Heavy Rainfall and Gale Weather in Alashankou City in 2017

摘要: 通过对阿拉山口地区2017年5月16日~19日一次大风暴雨天气影响系统的分析，总结造成此次暴雨天气的有利环流形势，为今后此类大风暴雨天气过程预报服务提供参考依据。此次暴雨天气过程，有明显的高空较强西南急流，中低层有明显的切变区移来，暴雨区正位于急流入口区右侧，暴雨发生时中低层表现为不稳定结构，配合有比湿大于10 g/kg的高湿区和强的水汽通量辐合中心，暴雨发生过程中伴随着强的辐合和垂直上升运动。

Abstract: Based on the analysis of the influence system of a gale and rainstorm in Alashankou area from May 16 to 19, 2017, the favorable circulation situation of the rainstorm was summarized to provide reference for the forecast service of such gale and rainstorm process in the future. During this rainstorm, there was obviously strong southwest jet at the upper level, and obvious shear area moved from the middle and lower levels. The rainstorm area was located at the right side of the entrance area of the jet stream. When the rainstorm occurred, the middle and lower levels showed an unstable structure, which was accompanied by high humidity area with specific humidity greater than 10 g/kg and strong water vapor flux convergence center, and the rainstorm was accompanied by strong convergence and vertical upward movement.