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Boundary conditions for WRF can be freely downloaded from ftp://ftp.ecmwf.int/pub/wrf. The output comes from ECMWF's operational HRES forecast and only one day's data is available. For more information please have a look at: ECMWF WRF Test Data. For those who have access to ECMWF MARS (access restricted) they can find the recipe how to retrieve the data for the past.
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