# NVIDIA publishes HealDA, an open AI model that builds a global weather starting state from raw observations

Canonical page: https://technooptimist.io/stories/nvidia-publishes-healda-an-open-ai-model-that-builds-a-global-weather-7f1c6b5c
Date: 16 Mar 2026
About: [NVIDIA](https://technooptimist.io/companies/nvidia.md) · [Earth-2](https://technooptimist.io/ai/earth-2.md)
Original source: https://huggingface.co/nvidia/healda

NVIDIA released HealDA on Hugging Face, the data-assimilation piece of Earth-2. It turns a short window of satellite and ground observations into a global picture of the atmosphere that off-the-shelf AI forecast models can start from, a job that traditionally takes hours of supercomputer time.

## Key facts

- Takes about 10 million observations per 24 hours: microwave sounders, ground stations, GNSS radio occultation and satellite winds.
- Outputs a roughly 1° (~100 km) global state, regridded to 0.25° for forecast models.
- A 330M-parameter vision transformer with 24 blocks, tested on H100 GPUs.
- Released under the NVIDIA Open Model License, which allows commercial use.

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