ArWen (Python package "gpuwm", preprocessor "rw-wps")
Copyright 2026 ArWen contributors

Licensed under the Apache License, Version 2.0. Third-party datasets,
tables, vendored components, and dependencies retain their own licenses
and notices. Per-asset provenance (sources, generation recipes, SHA-256
pins) is recorded in PROVENANCE.md and in the gpuwm/data/*/PROVENANCE.md
files beside each packaged asset.

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WRF / NCAR / UCAR

ArWen is an independent implementation. It is not affiliated with or
endorsed by the National Center for Atmospheric Research (NCAR) or the
University Corporation for Atmospheric Research (UCAR). The Weather
Research and Forecasting (WRF) model, developed at NCAR, is the
transcription and verification authority for ArWen's WRF-derived
mechanisms (WRF v4.6.1, https://github.com/wrf-model/WRF, released by
UCAR as open source per its own notice).

This distribution packages certain data assets generated with or copied
from the WRF v4.6.1 distribution, including: Thompson microphysics
lookup tables (generated with WRF's own table generator and
SHA-256-pinned), Noah land-surface parameter tables (VEGPARM.TBL,
SOILPARM.TBL, GENPARM.TBL; byte-identical to WRF's run directory), the
Kain-Fritsch lookup table, an ERA5 Vtable, and the RRTMG radiation data
files named below.

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RRTMG (Atmospheric and Environmental Research, Inc.)

The legacy-RRTMG radiation option transcribes WRF v4.6.1's RRTMG
longwave and shortwave schemes and packages the RRTMG_LW_DATA and
RRTMG_SW_DATA coefficient files and the ozone climatology files
distributed with WRF. RRTMG was developed by Atmospheric and
Environmental Research, Inc. (AER); its code and data carry AER's
copyright and license notices, which are retained with the assets.

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RTE+RRTMGP

The default radiation option uses k-distribution data from the
RTE+RRTMGP project (https://github.com/earth-system-radiation),
distributed under the BSD-3-Clause license, Copyright Atmospheric and
Environmental Research and contributors. The license text is retained
with the packaged data under gpuwm/data/rrtmgp.

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wrf-rust

Product rendering (gpuwm render) uses the "wrf-rust" Python package
(imported as "wrf") as its diagnostic core. wrf-rust is a separate
project with its own license and is installed via the optional
[render] extra; it is not vendored in this distribution.

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Vendored Rust crates

The GRIB decode workspace (tools/grib1_bridge) vendors its Rust
dependency sources for offline, locked builds. Each vendored crate
retains its own license; see tools/grib1_bridge/vendor.

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Data services (not redistributed)

ArWen downloads or templates requests for data from NOAA (GFS via the
NOMADS filter service and AWS Open Data; HRRR via AWS Open Data), from
the Copernicus Climate Data Store (ERA5; use is subject to the
Copernicus license and requires the user's own account), and relies on
the user-staged NCAR WPS geographical dataset (WPS_GEOG) for static
fields. None of these datasets are redistributed by this repository;
their terms are between the user and the provider.
