Update regional rose-stem to RAL4.beta1

[iboutle]

PR Summary

Sci/Tech Reviewer: annemccabe
Code Reviewer: Pierre Siddall (@Pierre-siddall)

Update rose-stem jobs to remove reference to ral3 (which is UM based) and start referring to things as ral4. Currently, this configuration is still a work in progress, and also is not the complete definition of ral4.beta1, with changes still making their way onto trunk in #699 and #725, which will update these apps in-turn.

This change adds new data to be stored in big_data_dir. Currently this exists at /data/users/ian.boutle/ral4b1 on spice and the HPC (note spice folder is smaller as it only contains the data required by spice jobs).

Code Quality Checklist

• I have performed a self-review of my own code
• My code follows the project's style guidelines
• Comments have been included that aid understanding and enhance the readability of the code
• My changes generate no new warnings
• All automated checks in the CI pipeline have completed successfully

Testing

• I have tested this change locally, using the LFRic Apps rose-stem suite
• If any tests fail (rose-stem or CI) the reason is understood and acceptable (e.g. kgo changes)
• I have added tests to cover new functionality as appropriate (e.g. system tests, unit tests, etc.)
• Any new tests have been assigned an appropriate amount of compute resource and have been allocated to an appropriate testing group (i.e. the developer tests are for jobs which use a small amount of compute resource and complete in a matter of minutes)

trac.log

Test Suite Results - lfric_apps - ral4b1/run1

Suite Information

Item	Value
Suite Name	ral4b1/run1
Suite User	ian.boutle
Workflow Start	2026-09-08T11:32:23
Groups Run	developer', 'lfric_atm_extra', 'lfric_atm_ral_ex1a_weekly

Dependency	Reference	Main Like
casim	MetOffice/casim@2026.07.1	True
jules	MetOffice/jules@2026.07.1	True
lfric_apps	iboutle/lfric_apps@ral4b1	False
lfric_core	MetOffice/lfric_core@3e965e8	True
moci	MetOffice/moci@2026.07.1	True
SimSys_Scripts	MetOffice/SimSys_Scripts@77a5166	True
socrates	MetOffice/socrates@2026.07.1	True
socrates-spectral	MetOffice/socrates-spectral@2026.07.1	True
ukca	MetOffice/ukca@9fc2b6d	True

Task Information

❌ failed tasks - 4

Task	State
check_lfric_atm_comp_tran_ref_3d_l120-BiP64x64-1500x1500_MG_ex1a_cce_fast-debug-32bit	failed
check_lfric_atm_rce-BiP64x64-1500x1500_MG_azspice_gnu_fast-debug-32bit	failed
check_lfric_atm_rce-BiP64x64-1500x1500_MG_ex1a_cce_fast-debug-32bit	failed
kgo_groups_checker	failed

✅ succeeded tasks - 1386

⌛ waiting tasks - 2

Task	State
housekeep_azspice	waiting
housekeep_ex1a	waiting

Security Considerations

• I have reviewed my changes for potential security issues
• Sensitive data is properly handled (if applicable)
• Authentication and authorisation are properly implemented (if applicable)

Performance Impact

• Performance of the code has been considered and, if applicable, suitable performance measurements have been conducted

AI Assistance and Attribution

• Some of the content of this change has been produced with the assistance of Generative AI tool name (e.g., Met Office Github Copilot Enterprise, Github Copilot Personal, ChatGPT GPT-4, etc) and I have followed the Simulation Systems AI policy (including attribution labels)

Documentation

• Where appropriate I have updated documentation related to this change and confirmed that it builds correctly

PSyclone Approval

• If you have edited any PSyclone-related code (e.g. PSyKAl-lite, Kernel interface, optimisation scripts, LFRic data structure code) then please contact the HPC Optimisation Team

Sci/Tech Review

• I understand this area of code and the changes being added
• The proposed changes correspond to the pull request description
• Documentation is sufficient (do documentation papers need updating)
• Sufficient testing has been completed

(Please alert the code reviewer via a tag when you have approved the SR)

Code Review

• All dependencies have been resolved
• Related Issues have been properly linked and addressed
• CLA compliance has been confirmed
• Code quality standards have been met
• Tests are adequate and have passed
• Documentation is complete and accurate
• Security considerations have been addressed
• Performance impact is acceptable

[annemccabe]

I've compared the changes to the RAL4beta1 configuration that we have in the RNS. The only differences are related to the native wind transport and leonard term options from the two issues that have yet to go on the trunk.

I'm happy for this to be passed into code review now.

[Ben Fitzpatrick (benfitzpatrick)]

I am happy with the README that Ian's supplied with the start dumps and LBC files