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 Latest IFS cycle

Table 1a: Key characteristics since 8th March 2016 of the atmospheric component of the ECMWF IFS

 

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)

SEAS 2011 version  Cycle 36r4

Seasonal forecast

Forecast

51

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

91

 

0.01 hPa

Yes (4)

Ensemble and Seasonal re-forecasts Cycle 41r1

Table 1b: Key characteristics since 12 May 2015 of the ENS and SEAS re-forecasts

 

Forecast/Analysis

Number of members

Horizontal resolution

Vertical levels

Pressure at model top (hPa)

Perturbation models

Number of years

ENS

  • 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

SEAS 2011 version  Cycle 36r4

Forecast

15

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

91

0.01 hPa

Yes (4)

30
(1981–2010)


Ocean general circulation component

Table 1c: Key characteristics since 19 November 2013 of the ocean component general circulation models of the ECMWF IFS

 

Forecast/Analysis

Number of members

Horizontal resolution

ORCA grid

Vertical levels

NEMO

Ocean model

Forecast

  • 0–13 months

51

42

ORAS4 Ocean reanalyses

ORTA4 Ocean Real Time Analysis

Analysis

5

42


Ocean-wave component

Table 1d: Key characteristics since 12 May 2015 of the ocean-wave component

 

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: 1° ~111km

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 since 2006 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