Composite and contrastive analysis of the heavy snowfall and the longest lasting light snowfall in guiyang area

Based on the statistics of the snowfall days in Guiyang area during 1997—2006,a composite analysis is conducted for 7 typical example of rea,including diagnositic and contrastive analysis of some kings of physical factors.The results show that circulation,influencing systems and physical condition of two kinds of snowfall are different.The environment and condition which is obtained by composite analysis can be used as reference in the forecasting snowfall and intensity of snowfall in Guiyang area.