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The input files for the WRF competition run can be downloaded from here (the uncompressed tar file is about 6.7 GB). For reference, the design for the 3-domain input was kindly provided by Xu Zhen, acknowledged in the 2020 Joint WRF/MPAS Users' Workshop Jian-Wen Bao's presentation. Slide 24 of his presentation has a figure depicting the locations of the three nested computational domains that WRF uses.
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