Diagnostic analysis of a server sandstorm in the midwest Inner Mongolia

According to the encryption sounding data,the automatic meteorological observing data and the conventional observing data,we analyzed a case of weather events occurred in the Midwest Inner Mongolia Autonomous Region on April 23-24,2009.The high and low air circulation system configuration and the momentum have been studied.The result showed that:(1) Mongolian cyclone was the main system producing the strong dust storm.(2) The momentum of the high altitude was of the great importance factor for sandstorm development.