# Clarification on models included in the multimodel\_mean

**URL:** <https://forum.ecmwf.int/t/clarification-on-models-included-in-the-multimodel-mean/14493>\
**Category:** AI Weather Quest\
**Created:** [8 December 2025 08:11 UTC](https://forum.ecmwf.int/t/clarification-on-models-included-in-the-multimodel-mean/14493 "2025-12-08T08:11:44Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Peng\_Lu](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/p/8dc957/32.png) [@Peng\_Lu](https://forum.ecmwf.int/u/Peng_Lu)\
**Post date:** [8 December 2025 08:11 UTC](https://forum.ecmwf.int/t/clarification-on-models-included-in-the-multimodel-mean/14493/1 "2025-12-08T08:11:44Z")

</div>

Hi, I have a quick question about the S2S models used in the AI Weather Quest.  
I noticed that the model overview page lists configuration details for seven​ dynamical models (ECMWF, ECCC, NOAA, KMA, JMA, CMA, HMCR). However, the leader board page seems to only show results for five​ of these models (ECMWF, ECCC, HMCR, JMA, NOAA).  
Could you please clarify: is the multimodel\_mean result calculated from all seven​ available models, or only from the subset of five​ that appear on the leader board?  
Thanks for your help

---

<div class="post-metadata">

**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 December 2025 08:47 UTC](https://forum.ecmwf.int/t/clarification-on-models-included-in-the-multimodel-mean/14493/2 "2025-12-08T08:47:10Z")

</div>

Hello @Peng_Lu

Thanks for your message.

Unfortunately the inclusion of dynamical model scores is dependent on forecast data stored on [ECMWF | S2S, ECMWF, Realtime, Daily averaged](https://apps.ecmwf.int/datasets/data/s2s/levtype=sfc/type=cf/) . For certain modelling centres, this dataset can be temperamental and miss out certain weeks.

For every week I attempt to download all seven models, compute a model average from all models downloaded, and then evaluate the respected fields for the leaderboards. I have tried to keep information regarding missing forecasts updated on [Sub-seasonal forecast models - AI Weather Quest - ECMWF Confluence Wiki](https://confluence.ecmwf.int/display/AWQ/Sub-seasonal+forecast+models), but please note I sometimes forget to update this page. An example of an issue includes CMA where no forecast data is present post 20250925.

Thanks,

Josh

---

<div class="post-metadata">

**Author:** ![Peng\_Lu](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/p/8dc957/32.png) [@Peng\_Lu](https://forum.ecmwf.int/u/Peng_Lu)\
**Post date:** [8 December 2025 09:03 UTC](https://forum.ecmwf.int/t/clarification-on-models-included-in-the-multimodel-mean/14493/3 "2025-12-08T09:03:44Z")

</div>

Thank You for Your Swift and Clear Response

---

<div class="post-metadata">

**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 December 2025 10:50 UTC](https://forum.ecmwf.int/t/clarification-on-models-included-in-the-multimodel-mean/14493/4 "2025-12-08T10:50:41Z")

</div>

Pleasure. I have also updated the confluence page with information regarding the latest missed forecasts.

---

<div class="post-metadata">

**Author:** ![Peng\_Lu](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/p/8dc957/32.png) [@Peng\_Lu](https://forum.ecmwf.int/u/Peng_Lu)\
**Post date:** [8 December 2025 13:07 UTC](https://forum.ecmwf.int/t/clarification-on-models-included-in-the-multimodel-mean/14493/5 "2025-12-08T13:07:27Z")

</div>

Super! Thank you very much.