Datasets

Forecasts using IFS EPS CY47R2 replicating operations (TCo639, ORCA025Z75). In this experiment, 251 members are forecast, rather than the usual 51. The ocean state has had a hydrostatically balanced estimate of anthropogenic influence (warming) since 1850-1900 added, such that the total anthropogenic influence is twice estimated at the present day (an equal but opposite perturbation to expid b2mg). The CO2 concentration was set to 615 ppm.

Forecasts using IFS EPS CY47R2 replicating operations (TCo639, ORCA025Z75). In this experiment, 251 members are forecast, rather than the usual 51. The ocean state has had a hydrostatically balanced estimate of anthropogenic influence (warming) since 1850-1900 removed. The CO2 concentration was set to 285 ppm. If you are interested in using these data, please let us know by contacting nicholas.leach@physics.ox.ac.uk .

Examples

101-member coupled IFS (cycle 47R3) subseasonal reforecasts covering the period 2001-2020 with forecasts initialized on February 1st, May 1st, August 1st, and November 1st. The atmosphere is configured with 137 vertical levels and uses the Tco319 cubic octahedral reduced Gaussian grid. The IFS is coupled hourly to the 75 level version of the NEMO v3.4 ocean model and the LIM2 sea-ice model, both of which use the ORCA025 tripolar grid. Coupling follows the implementation used in ECMWF CY47R3 operational reforecasts.

This diagram gives a measure of the effectiveness of the model by showing how far ahead in the ...

This diagram gives a measure of the effectiveness of the model by showing when the 1-SEEPS of ...

This diagram gives a measure of the effectiveness of the model by showing when the ACC of 500 ...

This diagram gives a measure of the effectiveness of the model by showing when the ACC of ...

This diagram gives a measure of the effectiveness of the model in forecasting 500 hPa heights at ...

This diagram gives a measure of the effectiveness of the model by showing when the ACC of 500 ...

This diagram gives a measure of the effectiveness of the model by showing how far ahead in the ...

This diagram gives a measure of the effectiveness of the model by showing when the 1-SEEPS of ...

The leaf area index determines the degree of evapotranspiration. The index varies in a climatological way in the model, month by month (and so will not change in a different way if there is anomalous weather)...

Lightning flash densities are diagnosed from forecast values of hydrometeor content, CAPE (convective available potential energy), and cloud base height that has been output by the convection scheme...

A meso-scale ensemble system focusing on short range probabilistic forecasts and profiting from advanced multi-scale ALARO physics. Its main purpose is to provide probabilistic forecast on daily basis for the national weather services of RC LACE partners. It also serves as a reliable source of probabilistic information applied to downstream hydrology and energy industry.

It is the Limited-area Ensemble Prediction System (LEPS), based on COSMO-model and implemented within COSMO (COnsortium for Small-scale Modelling, including Germany, Greece, Israel, Italy, Poland, Romania, Russia, Switzerland) implemented and maintained by Arpae-SIMC.

Single-member eddy-permitting reforecasts based on the IFS cycle 48r1 atmosphere run at Tco319 combined with the eORCA025 NEMO4-SI3 ocean and sea ice configurations. Forecasts consists of a single unperturbed member run for 32 days starting on the first of each month between 1995 and 2016, for a total of 264 start dates. Atmospheric fields are initialised from the the GLORYS12v1 eddy-rich global ocean reanalysis.

Examples

Single-member eddy-rich reforecasts based on the IFS cycle 48r1 atmosphere run at Tco319 combined with the eORCA12 NEMO4-SI3 ocean and sea ice configurations. Forecasts consists of a single unperturbed member run for 32 days starting on the first of each month between 1995 and 2016, for a total of 264 start dates. Atmospheric fields are initialised from the the GLORYS12v1 eddy-rich global ocean reanalysis.

Examples

Updated 2025-11-04. A 10+1 member coupled IFS (cycle 47R3) extended-range reforecast experiment covering the period 1959-2023 with forecasts initialized on the 1st, 8th, 15th, and 22nd, of each month. The atmosphere is configured with 137 vertical levels and uses the Tco199 cubic octahedral reduced Gaussian grid. The IFS is coupled hourly to the 75 level version of the NEMO v3.4 ocean model and the LIM2 sea-ice model, both of which use the ORCA1 tripolar grid. Coupling follows the implementation used in ECMWF CY47R3 operational reforecasts.

101-member coupled IFS (cycle 47R3) subseasonal reforecasts covering the period 2001-2020 with forecasts initialized on February 1st, May 1st, August 1st, and November 1st. The atmosphere is configured with 137 vertical levels and uses the Tco199 cubic octahedral reduced Gaussian grid. The IFS is coupled hourly to the 75 level version of the NEMO v3.4 ocean model and the LIM2 sea-ice model, both of which use the ORCA1 tripolar grid. Coupling follows the implementation used in ECMWF CY47R3 operational reforecasts.

This data set contains net fluxes at the surface, atmospheric mixing ratios at model levels, for carbon dioxide (CO2), methane (CH4) and nitrous oxide (N20).

ECMWF is now running a series of data-driven forecasts as part of its experimental suite. These machine-learning based models are very fast, and they produce a 10-day forecast with 6-hourly time steps in approximately one minute. The outputs are available in graphical form.

Currently, three of these models are available:

This diagram shows time evolution of a Madden-Julian Oscillation (MJO) index. ...

**Note:** In **June 2023** ECMWF implemented a **major upgrade ...**