Abstract:
Using the meterological datas and the airplane reports,and on the basis of the same weather evolvement,the article chose 9 examples of cold front of Guiyang to composite and diagnosis analysis of physics element.The result shows that:the shear line and cold front are the main reason that cause the windshear.The warm and wet air that transported by the low-level jet cause the humidity and temperature add.The temperature cause the turbulence enhance,high PV spreads downward from the upper cause momentum of upper spread downward,and enhance the turbulence of low-level.The distribute characteristic of the cold and warm advection of the front area add the differentials of speed.When the front moves,the narrow front area cause wind change,so it is the reason that cause windshear.There are many wave at the low-middle level,and there are speed windshear at the low-level.