Here are the meeting notes, formatted for clarity and readability.

JEDI Meeting Notes

Continuous DA & HTLM: Cleaning up various PRs submitted before the holidays.
Scalability: Beginning to vet continuous DA at larger scales.
TLM Toolbox: Added Tom Hill's TLM toolbox to fv3-jedi and SOCA; removed the now redundant linearization error application from both.
Documentation: Paper from Benjamin regarding NICAS.

IODA Converter

Seviri l1b Native SatPy Converter (PR #1722): Data is publicly available via the new EUMETSAT eumdac tool (Guide: EUMETSAT Data Access). Also includes other useful data, such as Copernicus missions.
NOAA bufr_query (PR #1730): Adds a "quiet find" for the NOAA bufr_query package to help enable MEPO support for NASA GMAO.

UFO

Mean Earth Radius Update (PR #3937):
Attention Needed: Please remind the team about this change.
- Renaming mean_earth_rad to mean_earth_rad_km to match the value.
- Adding mean_earth_rad_m (calculated from semi-major and semi-minor axes).
ABI G19 CRTM: Adding links for coefficients (PR #3928).
CI Fixes: Fixing Intel compiler test failures that were reproducible locally (PR #3938).
CF Compliance: Moving sea ice variables to CF-compliant names (from Anna S., PR #3942).

JCSDA & NOAA GSL (Ben R., Fabio, Raji, Guoqing Ge, Samuel)

OSDF Reader: Good progress; a draft PR is in place with the complete reader flow (load, filter, distribute steps).
Testing: Currently testing with large Skylab experiments to flush out bugs and missing functionality. A testable version is expected in a few weeks.
VADER: Many new recipes are being contributed, creating a review backlog for Steve V. (This work makes VADER a highly valuable component of JEDI).
Fixes: A number of UFO test failures and other defects have been resolved.

Technical Debt (Large PR): Addressed significant technical debt by aligning TL (Tangent Linear) and ADJ (Adjoint) with changes in forward operators. Some issues remain.
Stability (Smaller PR): Isolated potential for underflow and segfaults by changing error checking and temporary arrays.

GFS v17: Retrospective carrying on. Thanks to the core team for release branches; will tag when stable.
Configuration: Adopting JCB paradigm for YAMLs (HAFS and RFS systems) to separate configuration YAMLs from workflows.
ROPP Operator Comparison:
- Running a series of $$H(x)$$ comparing RMS and Bias.
- ROPP 1-D is not as good as others.
- ROPP 2-D looks the same; need to check increments.
- Discussion (Ron & Dan): Ron noted that at GMAO (ROPP vs. NDAM in OSSE), they usually didn't find differences in similar tests (no cycling). Dan noted that 2D wouldn't work in a GSI context but might show differences in cycling (which hasn't been done yet).

Updates: Primarily focused on updating the operational system; fewer JEDI-specific updates.
Issues:
- Reports of issues with LETKF, linearization, and bias correction (VarBC) that ctests did not capture. A PR exists with a ctest illustrating the problem caused by an increase in input data.
- GSIBEC issues will be addressed when Ricardo returns fully to JEDI.
- Testing shows differences going from GSI IODA to buffer gen files with radiance; currently investigating.
SOCA (Dorouk): Anna is helping with SOCA work regarding in-situ potential temperature differences to use VADER (close to merge).

RRFS/MPAS-JEDI: Focused on building a real-time experiment system to compare with other operational systems.
- Target: Get a good sense of how MPAS-JEDI compares to operations.
- Challenges: Technical issues unrelated to JEDI (e.g., file sizes).
Smoke & Dust: Working on a system using PM2.5. Conducting retrospective tests with fv3-jedi (smoke/dust) and mpas-jedi.
Evaluation: Evaluating radiance and radar reflectivity observations.

Optimization: Plug for a PR from Steve Sandbach to remove an extra geometry constructor and temporary increment needed for benchmarks on the next-gen supercomputer.
Ice Data: Updates on Ice Freeboard and ice thickness data (linearization error removal, etc.).

C++ Interface: Progress made on work with the Met Office.
CI Tests: A small PR broke a CI test; investigating the best way to fix it among several options.