Comparison Analysis of Wind Speed Records in Routine and CAWS Automatic Weather Station

Based on the wind speed and wind direction data observed in routine and automatic weather station in 2003 in Pingliang city,the statistical comparison of observed and extreme values in routine and automatic weather station from January to December in 2003 has been analyzed.The results show that in the influence of the systematic error of instruments and observational time error,the daily mean wind speed of routine station is 0.4 m/s less than automatic weather station,and the corresponding wind directions are nearly 40% in both routine and automatic weather stations,the ratio of disagreement over two directions is 4%.