Model Coverage

This file tracks what wxtrain can currently do for major training-relevant models.

Status labels:

• planned: URL/source planning is implemented
• inventory: remote inventory parsing and message search work
• subset: byte-range subset fetch works
• decode: GRIB decode works for at least one live field
• blocked: a known hard blocker remains

Live-Checked Coverage

These checks were run against live sources on 2026-03-16.

Model	Source	Planning	Inventory	Subset	Decode	Notes
HRRR	NOMADS	yes	.idx	yes	yes	Live 2t subset decoded cleanly
RAP	NOMADS	yes	.idx	yes	yes	Live 2t subset decoded cleanly via template 40 JPEG 2000
NAM	NOMADS	yes	.idx	yes	yes	Live 2t subset decoded cleanly
GFS	NOMADS	yes	.idx	yes	yes	Live 2t subset decoded cleanly
ECMWF IFS	ECMWF Open Data	yes	.index JSON-lines	yes	yes	Live 2t subset decoded cleanly via template 42 CCSDS/AEC
ERA5 single levels	CDS API	yes	n/a	n/a	yes	Live authenticated 2m_temperature retrieval, GRIB1 decode, render, and bundle export work
ERA5 pressure levels	CDS API	yes	n/a	n/a	yes	Live authenticated temperature@850 hPa retrieval, GRIB1 decode, render, and bundle export work

Current Interpretation

• NOAA operational training models are in good shape for HRRR, RAP, NAM, and GFS.
• ECMWF IFS open data is now fetchable and decodable through the Rust pipeline.
• ERA5 is now a real authenticated CDS flow in Rust for the single-level and pressure-level datasets.
• ERA5 no longer uses public byte-range subset logic; it uses request-driven CDS retrieval followed by local decode/export.

Concrete Blockers

RAP

• Live subset scans correctly as a GRIB2 Lambert Conformal field.
• Decode now works through template 40 using a pure-Rust JPEG 2000 decoder.
• Training bundle export also works from the decoded subset.

ECMWF Open Data

• Live planning works against data.ecmwf.int.
• Live .index JSON-lines parsing works.
• Live subset fetch works.
• Decode now works through template 42 using a pure-Rust CCSDS/AEC decoder.
• Training bundle export also works from the decoded subset.

ERA5

• wx-fetch now plans ERA5 retrievals as authenticated cds://... requests and executes them through the CDS Retrieve API.
• Credentials are discovered from env vars, local config files, or WSL config files on Windows.
• Live retrieval is verified for:
  • reanalysis-era5-single-levels
  • reanalysis-era5-pressure-levels
• The retrieved outputs are currently GRIB1, and wx-grib now decodes that operational simple-packed regular lat/lon path.
• The reanalysis-era5-complete dataset is still only planner-level and has not been live-verified here.

Practical Next Steps

1. Expand regression coverage beyond 2t to include additional RAP, ECMWF, and ERA5 parameters.
2. Add more GRIB1/GRIB2 templates and grid-template regressions now that both CDS and open-data sources are live.
3. Extend ERA5 live coverage to reanalysis-era5-complete if that dataset becomes training-critical.