# WRF-CMAQ coupled model with run time issue with WRF v4.5.2 or newer

**URL:** <https://forum.cmascenter.org/t/wrf-cmaq-coupled-model-with-run-time-issue-with-wrf-v4-5-2-or-newer/5437>\
**Category:** WRF-CMAQ\
**Created:** [December 12, 2024, 8:02pm UTC](https://forum.cmascenter.org/t/wrf-cmaq-coupled-model-with-run-time-issue-with-wrf-v4-5-2-or-newer/5437 "2024-12-12T20:02:10Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![wong.david-c](https://avatars.discourse-cdn.com/v4/letter/w/bcef8e/32.png) [@wong.david-c](https://forum.cmascenter.org/u/wong.david-c)\
**Post date:** [December 12, 2024, 8:02pm UTC](https://forum.cmascenter.org/t/wrf-cmaq-coupled-model-with-run-time-issue-with-wrf-v4-5-2-or-newer/5437/1 "2024-12-12T20:02:10Z")

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WRF-CMAQ coupled model user, please note that we have found that when the WRF-CMAQ coupled model constructed with WRF versions 4.5.2 or later will encounter a run time issue. The fix is posted on the release note page:

> **[CMAQ Release Notes: WRF CMAQ Coupled Model](https://github.com/USEPA/CMAQ/wiki/CMAQ-Release-Notes:-WRF-CMAQ-Coupled-Model#compatibility-issues-with-wrf-versions-452-and-later)**
>
> Code for U.S. EPA’s Community Multiscale Air Quality Model (CMAQ) which helps in conducting air quality model simulations - USEPA/CMAQ

Cheers,  
David