Name: ECMWF IFS ENS 0.1° ensemble mean
Creator: ECMWF
License: https://creativecommons.org/licenses/by/4.0/

GribStream Code: ifsenfomean0p1

ECMWF IFS ENS 0.1° ensemble mean: ECMWF ensemble-mean temperature at 850 hPa in °C; API temperatures remain in K.

ifsenfomean0p1 · ECMWF ensemble-mean temperature at 850 hPa in °C; API temperatures remain in K. Historical example: run 20 October 2026 12 UTC; valid 30 October 2026 12 UTC (+240 h). Nearest-cell rendering of the 0.1° output grid. Source: ECMWF, CC BY 4.0; visualization: GribStream.

About this forecast

ECMWF ensemble-mean forecasts at 0.1° for temperature, wind speed, geopotential height and sea-level pressure: large-scale weather guidance to 15 days.

What is ECMWF IFS?

IFS stands for Integrated Forecasting System. Developed by the European Centre for Medium-Range Weather Forecasts (ECMWF) in cooperation with Météo-France, it combines observations through data assimilation and advances a global Earth-system model using physical equations. Its atmosphere, land, ocean and wave components exchange information. These products belong to the short- and medium-range forecast family, extending to 15 days; ECMWF also develops the separate, machine-learning-based AIFS family. ECMWF documentation.

What this product is for

The ensemble mean is ECMWF’s average across ensemble forecasts. It emphasizes the shared large-scale signal, helping reveal temperature patterns, ridges and troughs when individual members disagree on their exact location. Averaging can weaken or blur localized extremes. Read it alongside spread and individual members when storm intensity or a specific threshold matters. ECMWF documentation.

Detail

Archive begins: 2026-10-20

Product page: https://www.ecmwf.int/en/forecasts/datasets/open-data

Key features:

Nine selectors: temperature at 250, 500 and 850 hPa; wind speed at 250 and 850 hPa; geopotential height at 300, 500 and 1000 hPa; mean sea-level pressure.
This is an ECMWF-computed statistic with no member dimension. Wind speed is a scalar field; its ensemble mean differs from the speed calculated from averaged wind components.
The 0.1° latitude–longitude grid samples the same IFS forecast as the 0.25° products. It has 3,600 × 1,801 points, with about 11 km north–south spacing. ECMWF’s atmospheric model runs at approximately 9 km. Finer output spacing preserves more spatial detail but does not itself establish local accuracy. The 0.1° distribution follows 0.25° by about two hours. ECMWF documentation.

Resolution: 0.1° · 3600 × 1801

Temporal coverage: 00 and 12 UTC: +0–144 h every 3 h, then +150–360 h every 6 h (15 days).

Primary uses: Synoptic pattern analysis, medium-range outlooks and a central forecast signal to pair with uncertainty information.

00 and 12 UTC: +0–144 h every 3 h, then +150–360 h every 6 h (15 days).

Related datasets

Parameters

Click a parameter to reveal variants in a compact table with ready-to-copy JSON selectors.

gh –Geopotential height (gpm)

3 variants

Height derived from geopotential divided by standard gravity (9.80665 m s-2).

Used on constant pressure levels to diagnose synoptic features (e.g., troughs, ridges, cyclones).
At the surface, it reflects orography (geopotential height of the surface).
A geopotential metre is approximately 2% shorter than a geometric metre.

Level	Horizon	Selector
`pl 1000`	0h-360h	`{"name":"gh","level":"pl 1000","info":""}`
`pl 300`	0h-360h	`{"name":"gh","level":"pl 300","info":""}`
`pl 500`	0h-360h	`{"name":"gh","level":"pl 500","info":""}`

msl –Mean sea level pressure (Pa)

1 variant

Atmospheric pressure adjusted to mean sea level, reflecting the weight of the air column.

Maps of mean sea level pressure highlight cyclones, anticyclones, and wind strength via contour spacing.
Often expressed in hPa or millibars (1 hPa = 1 mb = 100 Pa).

Level	Info	Horizon	Selector
`sfc`		0h-360h	`{"name":"msl","level":"sfc","info":""}`

t –Temperature (K)

3 variants

Air temperature throughout the atmosphere.

Units are kelvin (K); to convert to degrees Celsius (deg C), subtract 273.15.
Available on multiple vertical levels.

Level	Horizon	Selector
`pl 250`	0h-360h	`{"name":"t","level":"pl 250","info":""}`
`pl 500`	0h-360h	`{"name":"t","level":"pl 500","info":""}`
`pl 850`	0h-360h	`{"name":"t","level":"pl 850","info":""}`

ws –Wind speed (m s-1)

2 variants

Magnitude of wind velocity. The dataset determines whether this is the ensemble mean or standard deviation.

Level	Info	Horizon	Selector
`pl 250`		0h-360h	`{"name":"ws","level":"pl 250","info":""}`
`pl 850`		0h-360h	`{"name":"ws","level":"pl 850","info":""}`

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