2018年11月6—8日日喀则寒潮天气过程分析

Analysis of Cold Wave Weather Process in Shigatse from November 6 to 8,2018

利用常规观测资料、卫星云图等资料对2018年11月6—8日日喀则市寒潮大风天气过程的环流形势、动力条件、非绝热因子等进行分析。结果表明:(1)此次天气过程范围较广、持续时间长、降温幅度大、阵风强;(2)此次过程强降温主要由前期气温回升、温度平流和辐射冷却等因素造成;(3)大风的形成与冷平流、气压梯度、变压梯度、高空动量下传及地形条件等因素有密切联系。

The circulation situation,dynamic conditions and non adiabatic factors of the cold wave and gale weather process in Shigatse from November 6 to 8,2018 were analyzed by using conventional observation data and satellite cloud images.The results showed that:(1)the weather process had a wide range,long duration,large cooling range and strong gust;(2)The strong cooling in this process was mainly due to the early temperature rise,temperature advection,radiation cooling and other factors;(3)The formation of strong wind was closely related to cold advection,pressure gradient,variable pressure gradient,high-altitude momentum downward transmission and topographic conditions.