Geoscientific Model Development
Geoscientific Model Development
GMD
Articles | Volume 19, issue 18
Articles | Volume 19, issue 18
https://doi.org/10.5194/gmd-19-8995-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-19-8995-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 18
Model evaluation paper
 | Highlight paper
 | 
23 Sep 2026
Model evaluation paper | Highlight paper |  | 23 Sep 2026

The North American CORDEX-CMIP6 WRF evaluation run: comparing historical simulations from 25 km to convection-permitting scales

Jacob Stuivenvolt-Allen, Trude Eidhammer, Rachel McCrary, Melissa Bukovsky, Stefan Rahimi, Hsin-I Chang, and Seth McGinnis

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Editorial statement
Downscaling climate predictions is an essential requirement for understanding regional climate impacts. This in turn is enabler for decision makers planning climate change adaptation. This paper demonstrates the utility of 12km ensemble climate simulations in providing useful predictions at a cost that enables ensembles large enough to capture some of the uncertainty. This paper is essential reading for those needing to understand the tools available for regional climate predictions.
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Short summary

This study presents a new 12 km CORDEX (Coordinated Regional Downscaling Experiment )-CMIP6 (Coupled Model Intercomparison Project) WRF (Weather Research and Forecasting) simulation for North America, compared against an earlier 25 km CMIP5 version and a 4 km convection-permitting simulation. The updated run reduces temperature and precipitation biases, improves precipitation timing, and better captures tropical cyclone intensity. Extreme precipitation at 12 km closely matches convection-permitting results, offering a practical resolution for regional climate assessment.

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