# Missing ERA5 files

**URL:** <https://cms-helpdesk.ncas.ac.uk/t/missing-era5-files/2197>\
**Category:** Uncategorized\
**Tags:** Monsoon2, Monsoon3\
**Created:** [14 October 2026 08:15 UTC](https://cms-helpdesk.ncas.ac.uk/t/missing-era5-files/2197 "2026-10-14T08:15:09Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![rossherbert](https://avatars.discourse-cdn.com/v4/letter/r/82dd89/32.png) [@rossherbert](https://cms-helpdesk.ncas.ac.uk/u/rossherbert)\
**Post date:** [14 October 2026 08:15 UTC](https://cms-helpdesk.ncas.ac.uk/t/missing-era5-files/2197/1 "2026-10-14T08:15:09Z")

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Morning,

My nudged run on monsoon3 has just failed due to some missing ERA5 reanalysis files.

/projects/ukca-admin/analyses/era5/era5\_1deg-model-levs\_N48L137\_2025XXXXXX\_all.nc

There is a gap from 20250911 to 20250920 - then they reappear from 20250921. Please could you arrange for the missing ones to be added?

Thanks!

Ross

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**Author:** ![mdalvi](https://avatars.discourse-cdn.com/v4/letter/m/ad7895/32.png) [@mdalvi](https://cms-helpdesk.ncas.ac.uk/u/mdalvi)\
**Post date:** [14 October 2026 08:41 UTC](https://cms-helpdesk.ncas.ac.uk/t/missing-era5-files/2197/2 "2026-10-14T08:41:58Z")

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Hi Ross,

The datafiles are missing on the internal HPC as well so there seems to have been an issue while preprocessing as this is done in 10-day chunks.  
I will set off the download and processing again but it will take a few hours to complete, so apologies for the delay.  
Mohit

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**Author:** ![mdalvi](https://avatars.discourse-cdn.com/v4/letter/m/ad7895/32.png) [@mdalvi](https://cms-helpdesk.ncas.ac.uk/u/mdalvi)\
**Post date:** [15 October 2026 12:07 UTC](https://cms-helpdesk.ncas.ac.uk/t/missing-era5-files/2197/3 "2026-10-15T12:07:01Z")

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@rossherbert The 202509 files have now been re-processed and copied over.  
Let me know if you have any issues.