{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2025-02-25-ecmwf-aifs-operational-ai-weather/","md":"https://postcutoff.com/e/2025-02-25-ecmwf-aifs-operational-ai-weather/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"2025-02-25-ecmwf-aifs-operational-ai-weather","date":"2025-02-25","date_precision":"day","short_title":"AI weather forecasting goes operational","deck":"ECMWF's AIFS (Feb 2025), then NOAA's AI models (Dec 2025)","takeaway":"On 25 Feb 2025 the European Centre for Medium-Range Weather Forecasts made its machine-learned AIFS Single model operational alongside its physics model.","category":"science","category_label":"Science & math","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Result confirmed"]},"sources":[{"n":1,"title":"ECMWF: AI forecasts become operational","url":"https://www.ecmwf.int/en/about/media-centre/news/2025/ecmwfs-ai-forecasts-become-operational","type":"official","group":"primary","domain":"ecmwf.int"},{"n":2,"title":"NOAA deploys new generation of AI-driven global weather models","url":"https://www.noaa.gov/news-release/noaa-deploys-new-generation-of-ai-driven-global-weather-models","type":"official","group":"primary","domain":"noaa.gov"},{"n":3,"title":"CACM: AI weather forecasting goes operational","url":"https://cacm.acm.org/news/ai-weather-forecasting-goes-operational/","type":"press","group":"press","domain":"cacm.acm.org"}],"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["ECMWF","NOAA"],"title":"AI weather forecasting goes operational: ECMWF's AIFS (Feb 2025), then NOAA's AI models (Dec 2025)","summary":"On 25 Feb 2025 the European Centre for Medium-Range Weather Forecasts made its machine-learned AIFS Single model operational alongside its physics model. It was up to 20% better on tropical-cyclone tracks and used about 1,000× less energy per forecast. The AIFS ensemble followed on 1 Jul 2025. On 17 Dec 2025 NOAA deployed AIGFS (GraphCast-based), AIGEFS and the hybrid HGEFS operationally.","key_facts":["AIFS Single: operational 25 Feb 2025, ~28 km grid, ~1,000× less energy, up to 20% better cyclone tracks","AIFS ENS operational 1 Jul 2025; both upgraded to v2 on 12 May 2026","NOAA (17 Dec 2025): AIGFS uses 99.7% less compute; AIGEFS uses 9% of the physics ensemble's compute and gains 18–24 h of skill; HGEFS is billed as the first operational hybrid AI/physics ensemble","ECMWF Director-General Florence Rabier: 'This milestone will transform weather science and predictions.'"],"key_numbers":[],"tags":["weather","operational","public-sector"],"science":{"field":"climate-weather","subfield":"operational numerical weather prediction","problem":"Replacing or complementing physics-based operational forecasts","result":"Machine-learned models adopted as official operational forecasts by major national and international centres.","open_since":"","ai_system":["AIFS","AIGFS (GraphCast)","AIGEFS","HGEFS"],"human_role":"Human-built; used by operational forecasters","verification":{"key":"none","label":"Unverified claim","text":"Operational verification by ECMWF and NOAA"},"status":"confirmed","shock":""},"body_md":"## What happened\n\nWithin about 15 months of GraphCast's publication, the world's leading forecast centres began issuing official forecasts from machine-learned models.\n\n## Why it matters\n\nIt is one of the fastest transitions of AI research into critical public infrastructure.","disputed":[],"related":[{"id":"2026-08-06-weathernext-open-source","url":"https://postcutoff.com/e/2026-08-06-weathernext-open-source/","date":"2026-08-06","date_precision":"day","short_title":"DeepMind open-sources WeatherNext 2 and WeatherNext Cyclones with a Nature paper showing ~1 extra day of hurricane warning","deck":null,"takeaway":null,"category":"science","category_label":"Science & math","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Result confirmed"]},"sources":11,"official":4,"filed":"2026-09-29","updated":"2026-10-26","orgs":["Google DeepMind","Google Research"]},{"id":"2025-05-21-microsoft-aurora-earth-model","url":"https://postcutoff.com/e/2025-05-21-microsoft-aurora-earth-model/","date":"2025-05-21","date_precision":"day","short_title":"Microsoft's Aurora foundation model beats operational forecasts for air quality, waves, cyclones and weather","deck":null,"takeaway":"One model can be adapted cheaply to new environmental prediction tasks, including air pollution and ocean waves.","category":"science","category_label":"Science & math","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Result confirmed"]},"sources":2,"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Microsoft Research"]},{"id":"2023-11-14-graphcast-weather","url":"https://postcutoff.com/e/2023-11-14-graphcast-weather/","date":"2023-11-14","date_precision":"day","short_title":"GraphCast: ML weather model beats the world's best physics-based 10-day forecast on 90% of targets","deck":null,"takeaway":"It triggered the rapid move of AI weather models into operational forecasting worldwide.","category":"science","category_label":"Science & math","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Result confirmed"]},"sources":3,"official":3,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Google DeepMind"]}],"people":[],"posts":[],"videos":[],"models":[],"changes":[{"date":"2026-09-29","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-09-29","run":null,"sources_read":null,"updated":"2026-09-29","human_review":null,"version":{"date":"2026-10-04"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":null,"in_training_data":true},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":null,"in_training_data":true},{"model_id":"gemini-4-hydrogen","name":"Gemini 4 Hydrogen","cutoff":"2026-03","days_after":null,"in_training_data":true},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":null,"in_training_data":true}],"short_url":"https://postcutoff.com/s/ai-weather-forecasting-goes"}