ECMWF AIFS
ECMWF's AI-based forecasting model that provides global weather forecasts at 0.25° resolution.
Live Forecast Data
Global coverage at 0.25° resolution (721x1440 grid)
Four daily runs (00, 06, 12, 18 UTC)
20-day prediction horizon (480h, six-hourly)
Real-time data access via Python SDK or REST API
Technical Specifications
Available Weather Parameters
AIFS uses standardized variable naming conventions. For full details on the naming structure, see Weather Variable Naming.
2t
air_temperature_at_height_level_2m
Air temperature at 2m
K
10si
wind_speed_at_height_level_10m
Horizontal wind speed at 10m
m s⁻¹
10wdir
wind_direction_at_height_level_10m
Horizontal wind direction at 10m
Degrees true
100si
wind_speed_at_height_level_100m
Horizontal wind speed at 100m
m s⁻¹
100wdir
wind_direction_at_height_level_100m
Horizontal wind direction at 100m
Degrees true
msl
air_pressure_at_mean_sea_level
Mean Sea-level Pressure
Pa
z_500
geopotential_at_pressure_level_50000Pa
Geopotential
m² s⁻²
ssrd
surface_downwelling_shortwave_flux_sum_6h
Surface solar downward irradiance
J m⁻²
strd
surface_downwelling_longwave_flux_sum_1h
Surface thermal downward irradiance
J m⁻²
hcc
high_type_cloud_area_fraction
Cloud fraction in high levels of troposphere
range between [0,1]
mcc
medium_type_cloud_area_fraction
Cloud fraction in medium levels of troposphere
range between [0,1]
lcc
low_type_cloud_area_fraction
Cloud fraction in low levels of troposphere
range between [0,1]
tcc
cloud_area_fraction_at_entire_atmosphere
Cloud fraction
range between [0,1]
Additional Variables on Request
tcwv
atmosphere_mass_content_of_water_vapor
Total column vertically-integrated water vapour
kg m⁻²
2d
dew_point_temperature_at_height_level_2m
2 metre dewpoint temperature
K
t
air_temperature_at_pressure_level (at 13 levels)
Temperature at a specified pressure level
K
u
eastward_wind_at_pressure_level (at 13 levels)
U component of wind
m s⁻¹
v
northward_wind_at_pressure_level (at 13 levels)
V component of wind
m s⁻¹
q
specific_humidity_at_pressure_level (at 13 levels)
The mass of water vapour per kilogram of moist air at a specified pressure level
kg kg⁻¹
z
geopotential_at_pressure_level (at 13 levels)
The gravitational potential energy of a unit mass
m² s⁻²
tp
total_precipitation
Precipitation (accumulated over 6h)
mm
Note: For information on the previous naming convention used in EPT-1.5, see Legacy Naming.
Hindcast Data
Spatial Extent: Global, on a grid of 721x1440 (25 km resolution).
Data Access: Point queries (up to 25 points per request) via API or SDK. See Historical Data Examples for usage examples. For grid-based access, please contact [email protected].
Model
Temporal Extent
Forecast Horizon and Resolution
AIFS-Single v1.0
2025-06-06 - today
at 00, 06, 12, 18 UTC
480h, six-hourly
Extended Hindcast Data (Special Request Only)
Special Request Required: The following extended hindcast data is available but requires special access permissions and is not accessible through standard API/SDK access. Please contact [email protected] to request access.
Model
Extended Temporal Coverage
Forecast Horizon and Resolution
AIFS-Single v1.0
2023-01-02 - 2024-12-27
at 00, 06, 12, 18 UTC
480h, six-hourly
Last updated