# HiRO-ACEv2: Simulating extreme weather at 3 km resolution for a fraction of the cost: what I've logged

> HiRO-ACEv2: Simulating extreme weather at 3 km resolution for a fraction of the cost comes up in 2 posts of my AI log, from October 2026, and each item below links to the primary source. The sources come from Allen AI and Ai2, filed under open weights, agents and coding and science.

## Items

1. **HiRO-ACEv2: Simulating extreme weather at 3 km resolution for a fraction of the cost** (Allen AI, 14 Oct 2026): Pairs a 100 km emulator with a 3 km downscaler for about 1/300th the cost of X-SHiELD, with weights on Hugging Face. [Primary source](https://allenai.org/blog/hiro-acev2) · [Post](https://heyaliasif.com/ai/2026-10-14-hiro-acev2-earth-ai-deep-review#item-1)
2. **HiRO-ACEv2: Simulating extreme weather at 3 km resolution for a fraction of the cost** (Ai2, 14 Oct 2026): A new downscaling model that matches a physics simulation's high-resolution statistics to within 3% and produces global 3 km data at about 1/300th the cost, with models and notebooks available to download. [Primary source](https://allenai.org/blog/hiro-acev2) · [Post](https://heyaliasif.com/ai/2026-10-14-hiro-ace-deep-review-earth-ai#item-1)

## Posts

- 2026-10-14 [HiRO-ACEv2 opens 3 km climate runs, Earth AI and Deep Review](https://heyaliasif.com/ai/2026-10-14-hiro-acev2-earth-ai-deep-review)
- 2026-10-14 [HiRO-ACEv2, Deep Review goes public, Earth AI agents](https://heyaliasif.com/ai/2026-10-14-hiro-ace-deep-review-earth-ai)

Canonical: https://heyaliasif.com/ai/topics/hiro-acev2-simulating-extreme-weather-at-3-km-resolution-for-a-fraction-of-the-cost