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Public story · 2026-07-10 · high
Code is on GitHub and checkpoints on Hugging Face, and the ensemble median cut Hurricane Helene's track error by a third.
Why now: Microsoft posted the Aurora 1.5 release and the ECMWF comparison in the same July 10 research post.
Aurora 1.5 beat the European Centre's ensemble forecast on 88.9% of targets, and Microsoft released it with open weights, per the company's July 10 research post.
That's a real shift for anyone forecasting without access to a proprietary ensemble. Code sits on GitHub and checkpoints sit on Hugging Face. A lab that could never afford ECMWF-grade access can run a model that beats it.
The new version adds 22 weather variables and hourly temporal resolution on top of the earlier open Aurora model. It also adds probabilistic ensemble forecasting, which the earlier version didn't have.
On tropical cyclones, including Hurricane Helene, the ensemble median cut track error by about a third against the same ECMWF baseline.
The 88.9% figure matters less than the license. Anyone can run a model that beats one of the world's top forecasting centers without paying for proprietary access. I'd watch whether smaller forecasters start running Aurora 1.5 directly instead of waiting on ECMWF's own updates.
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Microsoft released Copilot / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Microsoft released Copilot); both cover Code, Microsoft; overlapping topics (beat, beating, code).
Hugging Face partners with NVIDIA / Shared entities / Earlier coverage
Linked by a graph relationship (Hugging Face partners with NVIDIA); both cover Code, GitHub, Microsoft; earlier Code coverage from 2026-06-23.
Microsoft criticizes Claude Code / Shared entities / Earlier coverage
Linked by a graph relationship (Microsoft criticizes Claude Code); both cover Code, GitHub, Microsoft; earlier Code coverage from 2026-04-28.