Climatic statistical characteristics of foggy weather in western Liaoning and its prediction

The climatic statistical characteristics of foggy weather in western Liaoning were analyzed using foggy weather data from four observation stations from 1995 to 2004.The surface and upper circulation favorable to forming fog and its occurrence frequency were also analyzed statistically.The forecast index of fog,proposed on the basis of the condition and mechanism of the fog occurrence,was validated by 10 years'data.The results showed that the general probability was 81%.The validation based on the data from 1st Jul.to 31st Dec.in the year of 2004 indicated that the forecast index of foggy weather could give a good prediction result with the vacancy rate of 22.2% and the miss rate of 5.1%.