喀什地区春季一场大风天气过程成因分析

Analysis of the Cause of a Gale Weather Process in Spring in Kashi

摘要: 本次分析利用常规观测资料，高空及地面实况资料，数值预报资料，对2017年4月13~14日喀什地区的一次大风天气进行分析。结果表明，此次大风形势属于不稳定西风槽东移型。地面冷空气沿偏西路径翻山进入盆地。3小时正变压与强冷空气有很好的对应关系。强烈的气压梯度和变压梯度使冷空气加速运动，风速增大，进而引起了全区性大风沙尘天气。

Abstract: In this analysis, conventional observation data, upper-air and ground real data, and numerical forecast data were used to analyze the gale weather in the Kashgar area on April 13~14, 2017. The results show that the gale situation belongs to the type of unstable westerly trough moving east. Cold air from the ground follows a westward path over the mountains into the basin. There is a good correspondence between 3-hour barotropic pressure and strong cold air. The strong pressure gradient and barotropic gradient accelerate the movement of cold air and increase the wind speed, thus causing the regional gale and dust weather.