The Subtle Weather Forecast of the Highway Traffic During 2008 Beijing Olympic Games

During 2008 Beijing Olympic Games, the short-term weather forecast and service for Beijing ring roads and highways is very important for people at home and abroad, and the task is undertaken by Beijing Weather Science and Technology Service Center.Statics analysis is done to check the correlation of observed weather factors of Beijing Observatory Station and 27 automatic weather stations at Beijing traffic section, 9 road surface automatic weather stations included. As a result, 97 simple linear equations are set up with correlation coefficients of each weather factors passing 0.01 level test. The highest air temperature, lowest air temperature, relative humidity correlation coefficients between automatic weather stations and Beijing Observatory Station are 0.9103--0.9884, 0.8777--0.9883, and 0.7499--0.9682. The correlation coefficient between the highest air temperature on freeway and the highest road surface temperature is 0.8502--0.9288. The correlation coefficient between the lowest air temperature and the lowest road surface temperature is 0.9171--0.9851.All linear equations are integrated into the Traffic Weather Forecast Platform, which could generate 5 short-term spatial subtle weather forecast products of the Second Ring Road, the Third Ring Road, the Fourth Ring Road, the Fifth Ring Road in 4 directions and 5 freeways as well. So the efficiency is greatly improved. These forecast products are published by newspaper, broadcast and 121 weather telephone service. During 2008 Beijing Olympic Games, based on short-term forecast products of Beijing Meteorological Observatory and the linear regression equation, objective weather forecast products of highway section are produced and applied in service.