Products based on an ensemble of forecasts providing an estimate of the reliability of a single forecast. The following sub-sets are available from the ENS-WAM:

## Dissemination schedule

### IV-i: Wave fields

(dissemination data stream indicator = W)

12 UTC based Forecast time | Time Available | 00 UTC based Forecast time | Time available |
---|---|---|---|

Forecast Day 0 | 19:00 | Forecast Day 0 | 07:00 |

Forecast Day 10 | 19:40 | Forecast Day 10 | 07:40 |

Forecast Day 15 | 20:00 | Forecast Day 15 | 08:00 |

Derived products Step 0 to 240 | 19:41 | Derived products Step 0 to 240 | 07:41 |

Derived products Step 246 to 360 | 20:01 | Derived products Step 246 to 360 | 08:01 |

### IV-ii: Probabilities

(dissemination data stream indicator = U)

12 UTC based Forecast time | Time Available | 00 UTC based Forecast time | Time available |
---|---|---|---|

Forecast Day 0 | 19:00 | Forecast Day 0 | 07:00 |

Forecast Day 10 | 19:40 | Forecast Day 10 | 07:40 |

Forecast Day 15 | 20:00 | Forecast Day 15 | 08:00 |

Derived products Step 0 to 240 | 19:41 | Derived products Step 0 to 240 | 07:41 |

Derived products Step 246 to 360 | 20:01 | Derived products Step 246 to 360 | 08:01 |

### IV-iii: Extreme Forecast Index & Shift of Tails

(dissemination data stream indicator = U)

12 UTC based Forecast time | Time Available | 00 UTC based Forecast time | Time available |
---|---|---|---|

Forecast Day 0 | 19:00 | Forecast Day 0 | 07:00 |

Forecast Day 10 | 19:40 | Forecast Day 10 | 07:40 |

Forecast Day 15 | 20:00 | Forecast Day 15 | 08:00 |

Derived products Step 0 to 240 | 19:41 | Derived products Step 0 to 240 | 07:41 |

Derived products Step 246 to 360 | 20:01 | Derived products Step 246 to 360 | 08:01 |

## Parameters

All tables are sortable by column. Use your browser search for specific parameters.

Terms convention | |
---|---|

(inv) | Invariant field. If requested these parameters can be provided free of charge |

### IV-i: Wave fields

**Product resolution:** 0.25° x 0.25° lat/long grid or any multiple thereof (global or sub-area)

Forecast time step | Base time | |
---|---|---|

T+0 to T+144 | 3-hourly | 00 UTC and 12 UTC |

T+150h to T+360h | 6-houlry (unless otherwise specified) | 00 UTC and 12 UTC |

Short name | Long name | Description | Unit | ID | Additional information |
---|---|---|---|---|---|

2DFD | 2D wave spectra (single) | Wave variance spectrum archived as a field for each discretized frequency and directional bin (what is actually encoded is log10 of the variance spectrum) | m**2 s radian**-1 | 140251 |
Not for forecast step 0 30 frequencies 24 directions |

BFI | Benjamin-Feir index | Benjamin-Feir index | dimensionless | 140253 | |

CDWW | Coefficient of drag with waves | Atmospheric drag coefficient influenced by the presence of waves | dimensionless | 140233 | |

DWI | 10 metre wind direction | Neutral 10m wind direction for all wave model sea points | degrees | 140249 | |

DWPS | Wave spectral directional width for swell | Spectral width of the total swell spectrum | dimensionless | 140228 | |

DWWW | Wave spectral directional width for wind waves | Spectral width of the windsea spectrum | dimensionless | 140225 | |

HMAX | Maximum individual weight | Estimation value of the maximum individual wave height | m | 140218 | |

MDTS | Mean direction of total swell | Mean direction computed from the total swell spectrum | degrees | 140238 | |

MDWW | Mean direction of wind waves | Mean direction computed from the windsea spectrum | degrees | 140235 | |

MP1 | Mean wave period based on first moment | Mean wave direction computed using the third most energetic partition of the swell spectrum | s | 140220 | |

MP2 | Mean wave period based on second moment | Mean wave period computed using the second frequency moment of the spectrum | s | 140221 | |

MPTS | Mean period of total swell | Mean wave period computed using the reciprocal frequency moment of the total swell spectrum | s | 140239 | |

MPWW | Mean period of wind waves | Mean wave period computed using the reciprocal frequency moment of the windsea spectrum | s | 140236 | |

MSQS | Mean square slope of waves | Mean square slope computed from the full wave spectrum | dimensionless | 140244 | |

MWD | Mean wave direction | Mean wave direction computed using the full spectrum | degrees | 140230 | |

MWD1 | Mean wave direction of first swell partition | Mean wave direction computed using the first most energetic partition of the swell spectrum | degrees | 140122 | |

MWD2 | Mean wave direction of second swell partition | Mean wave direction computed using the second most energetic partition of the swell spectrum | degrees | 140125 | |

MWD3 | Mean wave direction of third swell partition | Mean wave direction computed using the third most energetic partition of the swell spectrum | degrees | 140128 | |

MWP | Mean wave period | Mean wave period computed using the reciprocal frequency moment of the full spectrum | s | 140232 | |

MWP1 | Mean wave period of first swell partition | Mean wave period computed using the reciprocal frequency moment of the first most energetic partition of the swell spectrum | s | 140123 | |

MWP2 | Mean wave period of second swell partition | Mean wave period computed using the reciprocal frequency moment of the second most energetic partition of the swell spectrum | s | 140126 | |

MWP3 | Mean wave period of third swell partition | Mean wave period computed using the reciprocal frequency moment of the third most energetic partition of the swell spectrum | s | 140129 | |

P1PS | Mean wave period based on first moment for swell | Mean wave period computed using first frequency moment of the total swell spectrum | s | 140226 | |

P1WW | Mean wave period based on first moment for wind waves | Mean wave period computed using first frequency moment of the wind sea spectrum | s | 140223 | |

P2PS | Mean wave period based on second moment for swell | Spectral mean wave period computed using second frequency moment of the total swell spectrum | s | 140227 | |

P2WW | Mean wave period based on second moment for wind waves | Mean wave period computed using second frequency moment of the windsea spectrum | s | 140224 | |

PHIAW | Normalized energy flux into waves | Energy flux from wind to waves normalised by the product of the air density anf the cube of air side friction velocity | dimensionless | 140211 | |

PHIOC | Normalized energy flux into ocean | Energy flux from wind to ocean normalised by the product of the air density anf the cube of air side friction velocity | dimensionless | 140212 | |

PP1D | Peak period of 1D-spectra | Period corresponding to the peak of the one-dimensional wave spectrum | s | 140231 | |

RHOAO | Air density over the oceans | air density over the oceans as derived from the lowest model temperature, specific humidity and pressure of the atmospheric model over all wave model sea points NOTE: because it is produced as a wave model output, it is only defined over the ocean |
kg m**-3 | 140209 | |

SHTS | Significant height of total swell | Period corresponding to the peak of the one-dimensional wave spectrum | m | 140237 | |

SHWW | Significant height of wind waves | Significant wave height for the windsea wave spectrum | m | 140234 | |

SWH | Significant height of combined wind waves and swell | Significant wave height for the full wave spectrum | m | 140229 | |

SWH1 | Significant wave height of first swell partition | Significant wave height for the first most energetic partition of the | m | 140121 | |

SWH2 | Significant wave height of second swell partition | Significant wave height for the second most energetic partition of t | m | 140124 | |

SWH3 | Significant wave height of third swell partition | Significant wave height for the third most energetic partition of the | m | 140127 | |

TAUOC | Normalized stress into ocean | Momentum flux from wind to ocean normalised by the product of the air density anf the square of air side friction velocity | dimensionless | 140214 | |

TMAX | Period corresponding to maximum individual wave height | Period corresponding to maximum individual wave height | s | 140217 | |

UST | U-Component stokes drift | U-component stokes drift | m s**-1 | 140215 | |

VST | V-Component stokes drift | V-component stokes drift | m s**-1 | 140216 | |

WDW | Wave spectral directional width | Directional width of the full wave spectrum | dimensionless | 140222 | |

WIND | 10 metre wind speed | Neutral 10m wind speed for all wave model sea points | m s**-1 | 140245 | |

WMB (inv) | Model Bathymetry | Water depth used by the wave model | m | 140219 | |

WSK | Wave spectral kurtosis | Kurtosis of the sea surface elevation due to waves | dimensionless | 140252 | |

WSP | Wave spectral peakedness | Peakedness factor of the full wave spectrum | dimensionless | 140254 | |

WSS | Wave Spectral Skewness | Skewness of the sea surface elevation due to waves | dimensionless | 140207 | |

WSTAR | Free convective velocity over the oceans | This parameter is used to prescribe the level of wind gustiness which influence wave growth. It is calculated using parameters from the atmospheric model: w* = u* {1/kappa (Zi/(-L))} ^1/3 where u* is the friction velocity kappa is the von Karman constant Zi is the height of the lowest inversion L is the Monin-Obukhov length NOTE: because it is produced as a wave model output, it is only defined over the ocean |
m s**-1 | 140208 |

### IV-ii: Probabilities

**Product resolution:** 0.25° x 0.25° lat/long grid or any multiple thereof (global or sub-area)

**Instantaneous events**

Forecast time step | Base time | |
---|---|---|

T+24 to T+360h | 12-hourly | 00 UTC and 12 UTC |

**Averaged events**

Forecast ranges |
Base time |
---|---|

2 -day period covering 120h < T ≤ 168h |
00 UTC and 12 UTC |

3 -day period covering 168h < T ≤ 240h |
00 UTC and 12 UTC |

5 -day period covering 120h < T ≤ 240h |
00 UTC and 12 UTC |

5-day periods: 240h < T ≤ 360h |
00 UTC and 12 UTC |

Short name | Long name | Description | Unit | ID | Additional information |
---|---|---|---|---|---|

MWPG10 | Mean wave period of at least 10 s | Probability | % | 131079 | |

MWPG12 | Mean wave period of at least 12 s | Probability | % | 131080 | |

MWPG15 | Mean wave period of at least 15 s | Probability | % | 131081 | |

MWPG8 | Mean wave period of at least 8 s | Probability | % | 131078 | |

SWHG2 | Significant wave height of at least 2m | Probability | % | 131074 | |

SWHG4 | Significant wave height of at least 4m | Probability | % | 131075 | |

SWHG6 | Significant wave height of at least 6m | Probability | % | 131076 | |

SWHG8 | Significant wave height of at least 8m | Probability | % | 131077 |

### IV-iii: Extreme Forecast Index (EFI) & Shift of Tails (SOT)

Product resolution: 0.25° x 0.25° lat/long grid or any multiple thereof (global or sub-area)

1-day forecast ranges |
Base times |
---|---|

00-24, 24-48, 48-72,72-96, 96-120, 120-144, 144-168 | 00 UTC |

12-36, 36-60, 60-84, 84-108, 108-132, 132-156, 156-180 | 12 UTC |

MARS ABBREVIATION | LONG NAME | UNIT | PARAMETER ID | PERCENTILE (SOT only) |
---|---|---|---|---|

MAXSWHI | Maximum of significant wave height index |
(-1 to 1) |
132216 | 90th |

*Last updated: 14 March 2016*