Abstract:In this paper, the envelope, silhouette and mean topography schemes offered by the WRF model were used to simulate the snowstorm which occurred in Shangdong province during Dec. 20—21, 2005. The result shows that there is a great correlation between the snowstorm space-time distribution and topography, the more actual topography, the more actual space-time distribution. There is significant meso-scale gravity waves in the process of snowfall, the peak value of snow lags behind the wave crest of gravity waves. Gravity waves were strongly influenced by the terrain. The rougher terrain, the stronger the gravity waves and the slower the moving speed. When the strength of gravity waves are strong enough, the time difference that the snow peak lags behind the wave crest of gravity waves becomes quite long.