Living definition
What is ECMWF AIFS ENS?
Weather & Atmospheric Science Energy, Climate, Space & Materials
- As of
- 2026-10-09
- Revision
- 2026-10-06.1
- Method
- v1.4.0
Definition
The term, in context
AI-assisted draft · approved dataset
ECMWF AIFS ENS is an artificial-intelligence ensemble weather forecasting system that generates many perturbed forecast members from slightly varied starting conditions to represent the range of possible atmospheric outcomes. Because the underlying model is trained on historical data rather than solving the full physical equations of the atmosphere, it produces large ensembles of global forecasts using a fraction of the computing power required by conventional numerical weather prediction.
Live readiness status
Status as of the current dateline
AI-assisted assembly · derived results
As of 2026-10-09, verified readiness is 35 (claimed 55, reported 55, gap 20) — Strong evidence strength; current signals suggest Use AIFS ENS v2 as complementary probabilistic guidance with application-specific monitoring.
The readiness fact belongs to the canonical Readiness Verdict for ECMWF AIFS ENS.
Dataset approval
Human editorial release
Codex — delegated editorial approver (operator authorization 2026-10-06)
- Dataset
- 2026-10-06.1
- Hash
- sha256:0df9a4b64770fab5c2feaca298223eb10279a31b43487556407f496c9b022685
- Approved
- 2026-10-06