---
id: "2025-02-25-ecmwf-aifs-operational-ai-weather"
url: "https://postcutoff.com/e/2025-02-25-ecmwf-aifs-operational-ai-weather/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2025-02-25"
date_precision: day
category: science
importance: 4
confidence: high
status: [Result confirmed]
verification: Unverified claim
sources: 3
editor: human editor
human_review: null
version: "2026-10-04"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2025-02-25-ecmwf-aifs-operational-ai-weather/

# AI weather forecasting goes operational

Full title: AI weather forecasting goes operational: ECMWF's AIFS (Feb 2025), then NOAA's AI models (Dec 2025)

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.'

## What happened

Within about 15 months of GraphCast's publication, the world's leading forecast centres began issuing official forecasts from machine-learned models.

## Why it matters

It is one of the fastest transitions of AI research into critical public infrastructure.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): in its training data
- Claude Opus 5.5 (training cutoff June 2026): in its training data
- Gemini 4 Hydrogen (training cutoff March 2026): in its training data
- Grok 4.7 (training cutoff May 2026): in its training data

## Sources

1. [ECMWF: AI forecasts become operational](https://www.ecmwf.int/en/about/media-centre/news/2025/ecmwfs-ai-forecasts-become-operational) (ecmwf.int, official)
2. [NOAA deploys new generation of AI-driven global weather models](https://www.noaa.gov/news-release/noaa-deploys-new-generation-of-ai-driven-global-weather-models) (noaa.gov, official)
3. [CACM: AI weather forecasting goes operational](https://cacm.acm.org/news/ai-weather-forecasting-goes-operational/) (cacm.acm.org, press)

## Changes

- 2026-09-29 (filed): Created

## Related

- 2026-08-06: [DeepMind open-sources WeatherNext 2 and WeatherNext Cyclones with a Nature paper showing ~1 extra day of hurricane warning](https://postcutoff.com/e/2026-08-06-weathernext-open-source/index.md)
- 2025-05-21: [Microsoft's Aurora foundation model beats operational forecasts for air quality, waves, cyclones and weather](https://postcutoff.com/e/2025-05-21-microsoft-aurora-earth-model/index.md)
- 2023-11-14: [GraphCast: ML weather model beats the world's best physics-based 10-day forecast on 90% of targets](https://postcutoff.com/e/2023-11-14-graphcast-weather/index.md)