FourCastNet3 (FCN3) is the latest AI global weather forecasting system from NVIDIA Earth-2. FCN3 offers an unprecedented combination of probabilistic skill…

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FourCastNet3 is NVIDIA's latest AI weather forecasting system that combines probabilistic accuracy with exceptional computational efficiency. It matches leading ML models like GenCast in prediction accuracy while delivering 8x faster performance, completing 60-day forecasts in under 4 minutes on a single H100 GPU. The system uses spherical neural operators with local convolutions and introduces stochasticity through diffusion processes, enabling well-calibrated ensemble forecasting. FCN3 scales to 1,024 GPUs using novel model parallelism and maintains spectral fidelity even at extended 60-day forecasts, making it suitable for subseasonal weather prediction.

FourCastNet 3 Enables Fast and Accurate Large Ensemble Weather Forecasting with Scalable Geometric ML