This tutorial dataset can be downloaded from the WRFDA Users Page (http://www2.mmm.ucar.edu/wrf/users/wrfda/download/testdata.html), and will be described later in more detail. In your own work, however, you will have to create all these input files yourself. See the section Running Observation Preprocessor for creating your observation files. See the section Running gen_be for generating your background error statistics file, if you want to use cv_options=5, 6, or 7.
Before using your own data, we suggest that you start by running through the WRFDA- related programs using the supplied test case. This serves two purposes: First, you can learn how to run the programs with data we have tested ourselves, and second you can test whether your computer is capable of running the entire modeling system. After you have done the tutorial, you can try running other, more computationally intensive case studies, and experimenting with some of the many namelist variables.