Simulation Systems 2025.12.1 Release

Release date: 11th December 2025

Included Releases

• LFRic Apps vn3.0
• LFRic Core vn3.0
• UM vn14.0 (private within the MetOffice organisation)
• JULES vn8.0 (currently private, will hopefully soon be publically available)

Key Highlights

This is the first GitHub release for all these repositories. It includes:

• Removal of cylc7 support and move to using cylc vip instead of rose stem to launch test suites.
• Updated working practices for working with git and GitHub.
• Many optimisations to the LFRic Apps science code, through the NGARCH project.

Software Stack Updates

• Psyclone update to 3.2.2
• Fab update to 2.0
• Vernier update to 0.4.0
• YAXT update to 0.11.4