GribStream

ECMWF IFS Wave ENS 0.1° wave ensemble

GribStream Code: ifswaef0p1

ECMWF IFS Wave ENS 0.1° wave ensemble: Significant wave height spread in metres, calculated by GribStream as population standard deviation across all 50 perturbed members; cells require 50 valid values.
ifswaef0p1 · Significant wave height spread in metres, calculated by GribStream as population standard deviation across all 50 perturbed members; cells require 50 valid values. 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

50 ECMWF wave ensemble members at 0.1° for significant wave height, period and direction, supporting marine uncertainty analysis 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 wave ensemble carries alternative IFS weather scenarios into the coupled ecWAM wave forecasts. It helps assess how uncertainty in storm evolution changes wave height, period and direction at sea. GribStream exposes members 1–50; the wave control is a separate dataset. Compare member trajectories to evaluate the timing and persistence of suitable operating conditions. ECMWF documentation.

Detail

00 and 12 UTC: +0–144 h every 3 h, then +150–360 h every 6 h (15 days). 06 and 18 UTC: +0–144 h every 3 h (6 days). Cycle times are initializations; delivery follows later.
00 and 12 UTC: +0–144 h every 3 h, then +150–360 h every 6 h (15 days). 06 and 18 UTC: +0–144 h every 3 h (6 days). Cycle times are initializations; delivery follows later.

Related datasets

Parameters

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cdww –Coefficient of drag with waves (dimensionless)
1 variant

Parameter ID 140233

ECMWF param DB

Wave-model drag coefficient describing the surface stress coupling between winds and waves.

  • Published with ECMWF wave-model output and useful for diagnosing air-sea momentum exchange.
Level Info Horizon Selector
sfc 0h-360h
{"name":"cdww","level":"sfc","info":""}
h1012 –Significant wave height of all waves with periods from 10 to 12 seconds (m)
1 variant

Parameter ID 140114

ECMWF param DB

Significant wave height contributed by waves with periods from 10 to 12 seconds.

  • Period-band wave height fields help separate sea states by wave-period class.
Level Info Horizon Selector
sfc 0h-360h
{"name":"h1012","level":"sfc","info":""}
h1214 –Significant wave height of all waves with periods from 12 to 14 seconds (m)
1 variant

Parameter ID 140115

ECMWF param DB

Significant wave height contributed by waves with periods from 12 to 14 seconds.

  • Period-band wave height fields help separate sea states by wave-period class.
Level Info Horizon Selector
sfc 0h-360h
{"name":"h1214","level":"sfc","info":""}
h1417 –Significant wave height of all waves with periods from 14 to 17 seconds (m)
1 variant

Parameter ID 140116

ECMWF param DB

Significant wave height contributed by waves with periods from 14 to 17 seconds.

  • Period-band wave height fields help separate sea states by wave-period class.
Level Info Horizon Selector
sfc 0h-360h
{"name":"h1417","level":"sfc","info":""}
h1721 –Significant wave height of all waves with periods from 17 to 21 seconds (m)
1 variant

Parameter ID 140117

ECMWF param DB

Significant wave height contributed by waves with periods from 17 to 21 seconds.

  • Period-band wave height fields help separate sea states by wave-period class.
Level Info Horizon Selector
sfc 0h-360h
{"name":"h1721","level":"sfc","info":""}
h2125 –Significant wave height of all waves with periods from 21 to 25 seconds (m)
1 variant

Parameter ID 140118

ECMWF param DB

Significant wave height contributed by waves with periods from 21 to 25 seconds.

  • Period-band wave height fields help separate sea states by wave-period class.
Level Info Horizon Selector
sfc 0h-360h
{"name":"h2125","level":"sfc","info":""}
h2530 –Significant wave height of all waves with periods from 25 to 30 seconds (m)
1 variant

Parameter ID 140119

ECMWF param DB

Significant wave height contributed by waves with periods from 25 to 30 seconds.

  • Period-band wave height fields help separate sea states by wave-period class.
Level Info Horizon Selector
sfc 0h-360h
{"name":"h2530","level":"sfc","info":""}
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 Selector
sfc 0h-360h
{"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 Selector
sfc 0h-360h
{"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 Selector
sfc 0h-360h
{"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 Selector
sfc 0h-360h
{"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 Selector
sfc 0h-360h
{"name":"swh","level":"sfc","info":""}
wmb –Model bathymetry (m)
1 variant

Parameter ID 140219

ECMWF param DB

Bathymetry used by the ECMWF wave model.

  • This is a model-grid field used by the wave model, not an observed water-depth analysis.
Level Info Horizon Selector
sfc 0h-360h
{"name":"wmb","level":"sfc","info":""}

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