# \[Evaluation System Update\] Use of ERA5 for evaluating precipitation forecasts

**URL:** <https://forum.ecmwf.int/t/evaluation-system-update-use-of-era5-for-evaluating-precipitation-forecasts/11767>\
**Category:** AI Weather Quest\
**Tags:** technical-questions, announcements\
**Created:** [8 March 2025 08:34 UTC](https://forum.ecmwf.int/t/evaluation-system-update-use-of-era5-for-evaluating-precipitation-forecasts/11767 "2025-03-08T08:34:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Joshua\_Talib](https://forum.ecmwf.int/user_avatar/forum.ecmwf.int/joshua_talib/32/987_2.png) [@Joshua\_Talib](https://forum.ecmwf.int/u/Joshua_Talib)\
**Post date:** [8 March 2025 08:34 UTC](https://forum.ecmwf.int/t/evaluation-system-update-use-of-era5-for-evaluating-precipitation-forecasts/11767/1 "2025-03-08T08:34:15Z")

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❗ Effective immediately, all forecasts will be evaluated against [**initial ECMWF Reanalysis version 5 (ERA5) release data (ERA5T)**](https://climate.copernicus.eu/climate-reanalysis) ❗

This change is necessary due to restricted access to MSWEP data for commercial entities.

**Post-processed precipitation training data and precipitation-based evaluation datasets, including recent rainfall totals and historical quintile boundaries, are now exclusively derived from ERA5 or ERA5T.** These updated datasets are available via the AI Weather Quest Python Package.