GribStream

ECMWF Integrated Forecasting System Wave Ensemble Forecast (IFS Waef)

GribStream Code: ifswaef

Description

The IFS Wave Ensemble Forecast (IFS Waef) is ECMWF's probabilistic ocean wave guidance. It couples the WAM wave model with the atmospheric IFS, producing 51 equally likely members (50 perturbed + 1 control) every six hours. By sampling model and initial condition uncertainty, IFS Waef delivers a spread of plausible sea state scenarios—crucial for offshore operations, coastal engineering, and voyage optimisation.

This open data subset provides global wave fields on a 0.4° grid (≈45 km) in GRIB2 format, extending out to 360 h (15 days) for the 00 UTC and 12 UTC cycles.

Detail

Parameters

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

mp2 –Mean zero-crossing wave period (s)
1 variant

Parameter ID 140221

ECMWF param DB

Mean time between sea-surface crossings of mean sea level.

  • Derived from the two-dimensional wave spectrum that combines waves of different heights, lengths, and directions.
  • Useful with wave height to estimate time under water for coastal structures.
Level Info Horizon Introduced Selector
sfc 0h-360h 2024-03-01
{"name":"mp2","level":"sfc","info":""}
mwd –Mean wave direction (Degree true)
1 variant

Parameter ID 140230

ECMWF param DB

Mean direction of ocean surface waves averaged over the wave spectrum.

  • Accounts for both wind-sea and swell components.
  • Direction is in degrees true (0 = from north, 90 = from east).
Level Info Horizon Introduced Selector
sfc 0h-360h 2024-03-01
{"name":"mwd","level":"sfc","info":""}
mwp –Mean wave period (s)
1 variant

Parameter ID 140232

ECMWF param DB

Average time between successive wave crests based on the wave spectrum.

  • Accounts for both wind-sea and swell components.
  • Useful for sea state assessments and marine engineering.
Level Info Horizon Introduced Selector
sfc 0h-360h 2024-03-01
{"name":"mwp","level":"sfc","info":""}
pp1d –Peak wave period (s)
1 variant

Parameter ID 140231

ECMWF param DB

Period of the most energetic ocean waves associated with the spectral peak.

  • Computed from the reciprocal of the frequency at the peak of the wave spectrum.
  • Includes contributions from both wind-sea and swell.
Level Info Horizon Introduced Selector
sfc 0h-360h 2024-03-01
{"name":"pp1d","level":"sfc","info":""}
swh –Significant height of combined wind waves and swell (m)
1 variant

Parameter ID 140229

ECMWF param DB

Average height of the highest one-third of wind + swell waves.

  • Defined as four times the square root of the spectral variance (integral over all frequencies and directions).
  • Used to assess sea state and structural loading offshore.
Level Info Horizon Introduced Selector
sfc 0h-360h 2024-03-01
{"name":"swh","level":"sfc","info":""}

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