ArWen is an independent, GPU-native implementation of a WRF-ARW-class regional atmospheric model. It is not affiliated with or endorsed by NCAR or UCAR. The name is a wordmark for "the ARW solver, GPU-native"; the Python package is currently named gpuwm. Safety. ArWen is a research and educational tool. It is never a substitute for official forecasts and warnings from your national meteorological service. Do not use it to make safety decisions. Regional numerical weather prediction at convective scale has mostly required institutional clusters, which means most of the world runs on global-model guidance at 10-25 km. ArWen's aim is to put a verified, kilometer-scale limited-area model on a single consumer GPU: pick a point, size a nest ladder to your card, pull public analysis data, and run a 1 km (or 500 m) simulation of your own area on hardware you own -- especially in places where no national convection-permitting model exists.
Publisher’s description
What is ArWen?
ArWen by Fahrenheit Research is open-source Windows software. It is written in Rust.
Installation and requirements
The publisher provides Portable installers for 64-bit Windows. It runs without installation (portable).
Updates and version history
The current version is 2.9.8, released on October 26, 2026. The version history goes back to July 31, 2026: 38 releases, all linked to the official files. The last update is less than a month old.
Popularity and file types
The source code on GitHub (FahrenheitResearch/arwen) has 15 stars.
Project description on GitHub: “ArWen: GPU-native WRF-ARW-class regional weather model, verified against WRF v4.6.1”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Portable: runs without installation
- Updated in the last two months
Cons
- No native ARM64 build
In short: ArWen is an open-source Windows tool for 64-bit PCs.
Is ArWen safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
B654DC442A42BF6F3F622A05D3D81AD956F9CA957A6CFB2C0D02CB06DD0707D4· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 38 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 2.9.8Latest | October 26, 2026 | — | 64-bit ZIP |
| 2.9.7 | October 25, 2026 | — | 64-bit ZIP |
| 2.9.6 | October 24, 2026 | — | 64-bit ZIP |
| 2.9.5 | October 23, 2026 | — | 64-bit ZIP |
| 2.9.4 | October 22, 2026 | — | 64-bit ZIP |
| 2.9.3 | October 20, 2026 | — | 64-bit ZIP |
| 2.9.2 | October 18, 2026 | — | 64-bit ZIP |
| 2.9.0 | October 15, 2026 | — | 64-bit ZIP |
Install from the command line
Silent install ›winget install --id FahrenheitResearch.ArWen -eProgram files (.exe): gfs_grib2_bridge.exe, grib1_bridge.exe, grib2_dump.exe, grib2_inventory.exe, hrrr_grib2_bridge.exe, rw_fetch.exe, rw_wrfbatch.exe
Related guide: How to use winget: install and update apps
Information
- Publisher
- Fahrenheit Research
- Licence
- Apache-2.0
- Price
- Free
- Source code
- github.com/FahrenheitResearch/arwen
- Written in
- Rust
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- Portable
- Version
- 2.9.8
- Released
- October 26, 2026
- Added to the catalogue
- August 7, 2026
- Versions listed
- 38
- GitHub stars
- 15
- GitHub forks
- 6
- Website
- github.com
- winget ID
- FahrenheitResearch.ArWen
Ratings and reviews
No reviews yet. Be the first to rate it.
Frequently asked questions
Is ArWen free?
Yes. ArWen is open-source software under the Apache-2.0 licence.
Is ArWen safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install ArWen with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Does ArWen run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of ArWen?
The versions page lists all 38 versions with links to their official installer files, back to July 31, 2026.
Can I use ArWen without administrator rights?
Yes, it is portable: unpack and run it.
