GribStream Blog
ECMWF AIFS operational and ensemble now on GribStream
AIFS operational and ensemble datasets are live, providing AI-based global forecasts with both deterministic and probabilistic outputs.
On July 31, 2025, we added ECMWF AIFS Operational and AIFS Ensemble datasets. This brings AI-driven global forecasts into the same API you already use for numerical models.
About AIFS
AIFS is ECMWF's AI-based global forecasting system. The open-data subset runs on a 0.25 deg global grid with 00/06/12/18 UTC cycles and 6-hourly steps out to 360 h (15 days).
- AIFS Oper provides a single best-estimate forecast.
- AIFS Enfo provides a 51-member ensemble (50 perturbed + 1 control) for probabilistic workflows.
Why it matters
AI forecasts are now operationally relevant, and ensembles let you quantify uncertainty instead of relying on a single scenario. With AIFS in GribStream, you can:
- Compare AI vs. physics guidance (AIFS vs. IFS).
- Build percentiles and probability of exceedance products.
- Run backtests using as-of time travel for consistent evaluation.