Terms of use

Short version: these forecasts are an experiment, published freely, with no guarantee of accuracy. Do not make safety decisions with them. Last updated 12 Nov 2026.

What this is

Two Spherical Cows publishes experimental weather forecasts produced by a neural network (FourCastNet 3) running on personal hardware, initialised from publicly available NOAA analysis data. It is a research and curiosity project operated by an individual.

It is not a weather service, is not affiliated with NOAA, the National Weather Service, NVIDIA or any meteorological agency, and carries no official status of any kind.

No warranty, and a real warning

Forecasts are provided as-is, with no warranty of accuracy, completeness, timeliness or fitness for any purpose. Machine-learning weather models fail in ways that are not always obvious, and the verification pages on this site document cases where this one does.

Do not rely on anything here for decisions affecting safety, property or livelihood. For warnings and decisions that matter, use your national weather service — in the United States, the National Weather Service at weather.gov.

Use of the content

Forecast images and videos published here may be shared and reused with attribution to Two Spherical Cows. The underlying weather data is produced by NOAA and is in the public domain. Model weights and software belong to their respective authors under their own licences.

Please do not present this content as an official forecast or strip the context that identifies it as experimental output.

Availability

The site is run on a best-effort basis by one person. It may be unavailable, out of date, or discontinued without notice. Forecasts are published when the pipeline runs successfully and not on any guaranteed schedule.

Liability

To the fullest extent permitted by law, the operator accepts no liability for any loss or damage arising from use of, or reliance on, this site or its content.

Changes and contact

These terms may be updated; the current version is always the one published here. Questions can be sent to the contact address listed on the domain's registration.

These terms describe how the site is operated and are not legal advice.