Recast GPU WOOF
Today I ran a 12-hour simulation around Mount Fuji at 500 m resolution in the WOOF web app from Recast Systems, with boundary conditions from GFS 0.25°. I think the result is excellent: it ran on an RTX PRO 6000 (on-demand instance), took 11 minutes 40 seconds and cost 1.34 USD in total. Video demo below: https://blog-assets.ringsaturn.me/pic/2026/2026-10-10-recast-gpu-woof/recast-area-tsk-2026-10-10-1600gmt%2B9-mobile.mp4 This result surprised me somewhat. It means that in the future, if higher-resolution real-time observations become available (satellite remote sensing in particular), they could first be used to apply rapid rolling corrections to the assimilation output of large-scale models, and the corrected fields could then drive a model like WOOF, a port of WRF-ARW to the GPU. Local weather forecasting and hazard warning could improve as a result, forecasts of severe convective weather most of all. ...