AI ResearchJul 9, 2026, 4:46 PM

Aurora 1.5: Extending open foundation models for weather and Earth-system applications

30-second summary

Microsoft Research released Aurora 1.5, an upgraded version of its open foundation model for weather and climate prediction. The update introduces hourly forecasting and probabilistic ensemble methods to improve real-world accuracy.

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Aurora 1.5: Extending open foundation models for weather and Earth-system applications
Key takeaways
  • Aurora 1.5 introduces hourly forecasting and probabilistic ensemble methods, improving real-world weather and climate predictions.
  • The model now supports 22 additional variables, expanding its utility for energy grid management and disaster response.
  • Aurora 1.5 remains open-source, reinforcing Microsoft’s push for transparent and accessible AI in environmental science.
  • The update addresses a critical gap in high-resolution, uncertainty-aware weather forecasting for decision-makers.
Full story

Microsoft Research has unveiled Aurora 1.5, a significant upgrade to its open foundation model designed for weather and Earth-system forecasting. The new version expands the model’s capabilities by adding 22 additional variables, enabling hourly temporal resolution instead of daily or sub-daily intervals. This change allows for more granular and timely predictions, which are critical for applications in energy grid management, disaster preparedness, and climate monitoring.

The update also incorporates probabilistic ensemble forecasting, a technique that generates multiple prediction scenarios to quantify uncertainty. This feature is particularly valuable in high-stakes environments where decision-makers need to assess risk and plan for a range of possible outcomes. Aurora 1.5 builds on the original Aurora model, which was already recognized for its open-source approach and broad applicability across weather-related domains.

The release underscores Microsoft’s commitment to advancing AI-driven solutions for environmental challenges. By making the model more accessible and precise, Aurora 1.5 aims to support researchers, policymakers, and industries that rely on accurate weather and climate data.

Why this matters
Developers

Provides a powerful open-source tool for building advanced weather and climate applications with higher temporal resolution.

Businesses

Enables more accurate risk assessment and operational planning in energy, agriculture, and insurance sectors.

Students

Offers a cutting-edge example of AI applied to environmental science and open-source model development.

Everyone

Improves the reliability of weather forecasts, benefiting public safety and climate adaptation efforts.

Glossary
probabilistic ensemble forecasting
A method that generates multiple prediction scenarios to quantify uncertainty in weather and climate models.
open foundation model
An AI model released under an open-source license, allowing public access and modification for broader applications.
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