What is the quality assurance of the data?
The observations are all official observations taken by National Weather Service (NWS) approved locations and observers. Detailed quality control is performed on all observations, at the National Climatic Data Center (NCDC), ensuring the data you receive is of the highest accuracy. Each variable within the surface data and the upper air data undergoes several levels of quality control. The variables are compared to the averages and climatology of that station to check for possible errors. For a more complete guide to the quality control performed on the surface data you can go to the surface data quality control document courtesy of NCDC. For a more complete guide to the quality control performed on the upper air data you can go to the upper air quality control document courtesy of NCDC.
