ECMWF AIFS Ensemble

The ECMWF AIFS Ensemble (AIFS ENS) is ECMWF's data-driven (AI) global ensemble, providing a control forecast plus 50 perturbed-forecast members. Jua serves it from ECMWF Open Data.

Live Forecast Data

• Global coverage at 25 km resolution (720x1440 grid)

• Four daily runs (00, 06, 12, 18 UTC)

• 360h forecast (15 days) for every run

• 6-hourly time steps throughout (0–360h)

• Real-time data access via Python SDK or REST API

Technical Specifications

Available Weather Parameters

ECMWF AIFS ENS uses standardized variable naming conventions. For full details on the naming structure, see Weather Variable Naming.

Code	API Name	Description	Units
2t	air_temperature_at_height_level_2m	Air temperature at 2m	Kelvin
2d	dew_point_temperature_at_height_level_2m	Dew-point temperature at 2m	Kelvin
skt	surface_temperature	Surface (skin) temperature	Kelvin
10si	wind_speed_at_height_level_10m	Horizontal wind speed at 10m	m s⁻¹
100si	wind_speed_at_height_level_100m	Horizontal wind speed at 100m	m s⁻¹
10wdir	wind_direction_at_height_level_10m	Horizontal wind direction at 10m	Degrees true
100wdir	wind_direction_at_height_level_100m	Horizontal wind direction at 100m	Degrees true
sp	surface_air_pressure	Surface pressure	Pa
msl	air_pressure_at_mean_sea_level	Mean Sea-level Pressure	Pa
tp	precipitation_amount_sum_1h	Total Precipitation	mm m⁻²
ssrd	surface_downwelling_shortwave_flux_sum_1h	Surface solar downward irradiance	J m⁻²

Hindcast Data

Data Access: Hindcasts are available via API or SDK. For bulk, grid-based access, please contact [e-mail].

Model	Spatial Extent	Temporal Extent
ECMWF AIFS ENS	Global, 25 km resolution (720x1440 grid)	2025-07-01 - today