Abstract:

In order to research the circulation background and influence system which brought about the snowstorm process and the favorable configuration of physical space structure during the strong snowfall in Shanxi, so the snowstorm, which occurred on November 28-29, 2011, was analyzed from the 500 hPa circulation background, the altitude system disposition, the mutual configuration of middle-lower system influence, the evolution of the fy-2c satellite cloud picture, the spatial vertical section of physical quantity field (vertical velocity, divergence, relative humidity). The result showed that the storm weather was formed in the 500 hPa west wind trough, 700 hPa shear and 850 hPa easterly wind continued, 700 hPa shear was closely related with the evolution process of fy-2c cloud pictures, especially a phase change was consistent, they were the directly affect system of snowstorm. The strong rise movement, deep wet layer and the smooth allocation of upper radiation and lower convergence formed the snowstorm favorable conditions. This research of snowstorm weather process would give an instructive reference information of snowstorm forecast in the future.