We’ll start by discussing this presentation by Zhiquan (Jake) Liu from NCAR MMM: http://www2.mmm.ucar.edu/wrf/users/wrfda/Tutorials/2015_Aug/docs/WRFDA_Overview.pdf
Then, we will talk about observational pre-processing: http://www2.mmm.ucar.edu/wrf/users/wrfda/Tutorials/2015_Aug/docs/WRFDA_Observations.pdf
Like the WRF Users’ page, there is a WRFDA page: http://www2.mmm.ucar.edu/wrf/users/wrfda/