More BL diagnostics for PS49

[iboutle]

PR Summary

Sci/Tech Reviewer: Adrian Lock (@Adrian-Lock)
Code Reviewer: Erica Neininger (@ericaneininger)

Diagnostics requested by R2O for downstream uses as part of PS49

UM stashcode	LFRic id
3-344	surface__t10m_ssi
3-345	surface__q10m_ssi
3-355	turbulence__thermal_speed
3-576	surface__visibility_with_precip_land
3-577	surface__visibility_with_precip_ssi
6-203	orographic_drag__sd_orog
9-208	cloud__cloud_base_0p1_okta
9-212	cloud__cloud_base_4p5_okta
9-215	cloud__cloud_base_7p9_okta

We also rename:

• cloud__cloud_base_altitude to cloud__cloud_base_2p5_okta
• cloud__cloud_top_altitude to cloud__cloud_top_2p5_okta
  for consistency with the new diagnostics

tag3.1_new_bl_diags tagged for use at vn3.1

Some example output of the new diagnostics:

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 - new_bl_diags/run1

Suite Information

Item	Value
Suite Name	new_bl_diags/run1
Suite User	ian.boutle
Workflow Start	2026-07-28T13:09:11
Groups Run	developer', 'lfric_atm_nwp_gal9_oper-C224_MG_ex1a_cce_production-32bit

Dependency	Reference	Main Like
casim	MetOffice/casim@2026.07.1	True
jules	MetOffice/jules@2026.07.1	True
lfric_apps	iboutle/lfric_apps@new_bl_diags	False
lfric_core	MetOffice/lfric_core@2026.07.1	True
moci	MetOffice/moci@2026.07.1	True
SimSys_Scripts	MetOffice/SimSys_Scripts@2026.07.1	True
socrates	MetOffice/socrates@2026.07.1	True
socrates-spectral	MetOffice/socrates-spectral@2026.07.1	True
ukca	MetOffice/ukca@2026.07.1	True

Task Information

✅ succeeded tasks - 1213

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 TCD 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

[github-actions]

⚠️ Hello iboutle!

Your CLA signature was found on the base branch, but you appear to have modified the CONTRIBUTORS.md file in this PR.

Please do not edit the CONTRIBUTORS.md file. If you have already signed the CLA, revert changes to the file and your signature will be picked up.

[Adrian Lock (Adrian-Lock)]

Looks good. New names for cloud cover diagnostics that includes the cloud octa threshold is a good idea. Approving

[iboutle]

Erica Neininger (@ericaneininger) this is ready for code review