Ai2 Releases HiRO-ACEv2 Climate Simulation Model
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On October 15, 2026, Ai2 announced on the Hugging Face Blog the release of the HiRO-ACEv2 climate simulation model, claiming it can simulate extreme weather at 3 km global resolution at about 1/300 the cost of traditional methods. The model includes a new downscaling model, HiROv2, which can simultaneously predict multiple high-resolution fields such as rainfall, wind, and pressure. When fed coarsened X-SHiELD data, HiROv2's high-resolution statistical match error for one-in-a-million-probability extreme events is within 3%, and it can generate structurally realistic hurricanes and downslope windstorms in mountainous regions. The model is now available on the Hugging Face platform, with no other follow-up reports yet.
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- Hugging Face BlogHiRO-ACEv2: Simulating extreme weather at 3 km resolution for a fraction of the cost
Ai2 released HiRO-ACEv2; the new downscaling model HiROv2 can predict multiple high-resolution fields—rainfall, wind, and pressure—simultaneously, and with coarsened X-SHiELD data as input it matches the high-resolution statistics of even one-in-a-million extreme events to within 3%, generating structurally realistic hurricanes and mountain downslope windstorms.
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