The Temporal and Spatial Distribution Characteristics of Heavy Fog in Yining

By using the data in Yining of Xinjiang from 1994 to 2006,this paper analyzed the statistic characteristics of climatology and synoptic for heavy fog and explicated the features of radiation fog and advection fog as two major types,and from the point of view of synoptic summarized the characteristics of meteorological element forming radiation fog and the circulation situation at upper air and lower level forming advection fog.The results showed that Yining occur fog frequently,its variation features of annual,seasonal,monthly and daily to be obvious and their appeared probability to be almost same for radiation fog and advection fog affecting flight.So several typical synoptic situation of fog are summing-up.It is valuable for forecaster to predict heavy fog timely and accurately.In addition,the landform impact the fog emergence and their area sizes are pointed out.