Documentation and support

Operational configurations of the ECMWF  Integrated Forecasting System  (IFS)

These tables summarise the key characteristics of ECMWF IFS model, offering links to documentation on data description, graphical products, cycle information, resolution, etc.

See also

In this page:

Atmospheric general circulation component

Table 1a: Key characteristics  of the atmospheric component of the ECMWF IFS (Based on the latest IFS cycle)

 

Forecast / Analysis

Number of members

Horizontal resolution

Vertical levels

Pressure at model top (hPa)

Perturbation models

HRES

Atmospheric Model high resolution

Forecast

  • 0–10 days

1

  •  Native (1): O1280 ~9km
  •  Interpolated (2): 0.1°  ~9km

137

0.01 hPa

No

ENS

Ensemble - Atmospheric Model

Forecast

  • 0–15 days
51

Day 0-15

  • Native (1): O640 ~18km
  • Interpolated (2):0.2°
91 0.01 hPa

Yes (4)

ENS Extended

Atmospheric Model Extended forecast (monthly)

Forecast

  • 16–46 days
  • run twice a week
51
  • Native (1): O320 ~36km
  • Interpolated (2): 0.4°

 

91

0.01 hPa Yes (4)

4DVAR

4-Dimensional data assimilation

Analysis

1

  •  N128/N160/N200 inner loops
  • O1280 outer loop

 

137

 

0.01 hPa

No

EDA

Ensemble of data assimilations

Analysis

25

  •  N96/N96 inner loops
  • O640 outer) 

137

0.01 hPa

Yes (5)

SEAS5 2017 version  Cycle 43r1

Seasonal forecast

Forecast

  • long-range forecast run monthly from 0 to 7 months
  • annual range forecast run quarterly from  0 to 13 months

51

 


15

  • Native (1):O320 ~36km
  • Interpolated (2): 0.4°

91

0.01 hPa

Yes (4)

Ensemble and Seasonal re-forecasts

Table 1b: Key characteristics of the ENS and SEAS re-forecasts of the ECMWF IFS

 

Forecast/Analysis

Number of members

Horizontal resolution

Vertical levels

Pressure at model top (hPa)

Perturbation models

Number of years

ENS Cycle 43r3

  • 0–46 days
  • run twice a week
11

Day 0-15

  • Native (1): O640
  • Interpolated (2): 0.25° ~18km

Day 16-46

  • Native (1): O320
  • Interpolated (2): 0.5° ~55km
91 0.01 hPa Yes (4) Most recent 20

SEAS5  Cycle 43r1

Seasonal forecast

Forecast

  • run monthly
  • 0–7 months (monthly)

 

  • run quarterly 0-13 months (annual range)

 

25

 


15

  • Native (1):O320 ~36km
  • Interpolated (2): 0.4°

91

 

0.01 hPa Yes (4) 36 (1981-2016)

Ocean general and sea ice

Table 1c: Key characteristics of the ocean component general circulation models of the ECMWF IFS

 

Forecast/Analysis

Number of members

Horizontal resolution

ORCA grid

Vertical levels

NEMO (LIM-2)

Forecast

  • daily (HRES and ENS)
  • run monthly
  • 0–7 months (monthly)
  • run quarterly 0-13 months (annual range)

51

0.25°

75

Oceans

  • OCEANS-BRT (Behind Real-Time)
  • OCEANS-RT (Real-Time)

Analysis

Reanalysis

5

0.25°

75


Ocean-wave component

Table 1d: Key characteristics of the ocean-wave component of the ECMWF IFS

 

Forecast/Analysis

Domain

Number of members

Horizontal resolution

HRES-SAW

Ocean Wave standalone model

Analysis and forecast

  • 0–10 days

Global

1

  • Native: 0.1° reduced (3) ~11km
  • Interpolated (2)0.1° ~11km

HRES-WAM

Ocean Wave coupled to the atmospheric model

Analysis and forecast

  • 0–10 days

 

Global

1

  • Native: 0.125° reduced (3) ~14km
  • Interpolated (2)0.125°~ 14km

ENS-WAM

Ensemble wave forecast

Forecast

  • 0-46 days

Global

51

0-15 days

  • Native: 0.25° reduced (3)  ~28km
  • Interpolated (2): 0.25° ~28km

16-46 days

  • Native: 0.5° reduced (3)  ~55km
  • Interpolated (2): 0.5° ~55km

SEAS-WAM

Seasonal wave forecast

Forecast

  • run monthly
  • 0–7 months (monthly)
  • run quarterly 0-13 months (annual range)

Global

51

  • Native: 0.5° reduced (3)  ~55km
  • Interpolated (2): 0.5° ~55km

Atmospheric and Ocean-wave reanalysis Cycle 31r2

 

Forecast/Analysis

Number of members

Horizontal resolution

Vertical levels

Pressure at model top (hPa)

Perturbation models

ERA Interim

Atmospheric Reanalysis

Analysis

  • Forecast 0-10 days

1

  • Native (1): N128 ~80 km
  • Interpolated (2):  0.75° ~83km

 

60

0.1 hPa

No

ERA Interim Wave

Wave Reanalysis

Analysis

  • Forecast 0-10 days
1
  • Native(3) : 1.0° ~111km
    No

Table 1e: Key characteristics of the ERA Interim reanalyses

  • (1) Native: as produced by the model on reduced Gaussian grids or spherical harmonics.
  • (2) Interpolated to lat/lon
  • (3) Native: as produced by the model on reduced lat/lon grids.
  • (4) in analysis and model physics
  • (5) in observations and model physics