# AIFS Hindcasts/Re-forecasts

**URL:** <https://forum.ecmwf.int/t/aifs-hindcasts-re-forecasts/14507>\
**Category:** AIFS\
**Tags:** aifs\
**Created:** [11 December 2025 14:12 UTC](https://forum.ecmwf.int/t/aifs-hindcasts-re-forecasts/14507 "2025-12-11T14:12:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Brian\_Etherton1](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/b/f6c823/32.png) [@Brian\_Etherton1](https://forum.ecmwf.int/u/Brian_Etherton1)\
**Post date:** [11 December 2025 14:12 UTC](https://forum.ecmwf.int/t/aifs-hindcasts-re-forecasts/14507/1 "2025-12-11T14:12:58Z")

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Hello there one and all,

I was curious if there had been any desire to run hindcasts for the AIFS ensemble for cases prior to 2025. Perhaps go back a few years? I ask because such hindcasts (perhaps a better term is ‘re-forecast’?) are useful in diagnosing model performance.

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**Author:** ![Matthew\_Chantry](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/m/d07c76/32.png) [@Matthew\_Chantry](https://forum.ecmwf.int/u/Matthew_Chantry)\
**Post date:** [31 March 2026 11:57 UTC](https://forum.ecmwf.int/t/aifs-hindcasts-re-forecasts/14507/2 "2026-03-31T11:57:42Z")

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Hi Brian,  
Hindcasts are a likely addition with v3 of the AIFS.