HRESWAM (High RESolution WAve Model) is coupled to the atmospheric model (HRES) while HRESSAW (High RESolution Stand Alone Wave model) is run as a standalone model.
HRESWAM and HRESSAW offer the same parameters globally. However, the resolution and the dissemination schedule are different.
HRESWAM Direct model output Products offers "High Frequency products":
 4 forecast runs per day (00/06/12/18) (see dissemination schedule for details)
 Hourly steps to step 90 for all four runs
Domain
 HRESWAM: Global
 HRESSAW: Between latitudes 78 and 90
Both HRESWAM and HRESSAW models computes between the latitudes 78 and 90. For HRESWAM, the output grid is artificially extended to 90.
Product description
 HRESWAM: 0.125° x 0.125° lat/long grid or any multiple thereof (global or subarea)
 HRESSAW: 0.1° x 0.1° lat/long grid or any multiple thereof (global or subarea)
Single level forecast  HRESWAM
Forecast time step  Base time  

T+0 to T+90  1hourly  00 UTC, 06 UTC, 12 UTC and 18UTC 
T+93 to T+144  3hourly  00 UTC and 12 UTC 
T+150h to T+240h  6hourly  00 UTC and 12 UTC 
Single level forecast HRESSAW
Forecast time step  Base time  

T+0 to T+144  3hourly  00 UTC and 12 UTC 
T+150h to T+240h  6hourly  00 UTC and 12 UTC 
Dissemination schedule
Forecast Runs (base time)  Forecast step frequency  Forecast Dissemination schedule  Forecast Dissemination stream indicator 

00 UTC 



06 UTC 



12 UTC 



18 UTC 



HRESSAW
Forecast Runs (base time)  Forecast step frequency  Forecast Dissemination schedule  Forecast Dissemination stream indicator 

00 UTC 



12 UTC 



Parameters
Short Name  Long name  Description  Unit  ID  Additional information 

2DFD  2D wave spectra  Wave variance spectrum archived as a field for each discretized frequency and directional bin (what is actually encoded is log10 of the variance spectrum)  m2 s radian1  140251 
Coded in 36 frequencies and 36 directions Not for step 0 
BFI  BenjaminFeir index  BenjaminFeir index  dimensionless  140253  
CDWW  Coefficient of drag with waves  Atmospheric drag coefficient influenced by the presence of waves for all wave model sea points  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 wind sea spectrum  dimensionless  140225  
H1012  Significant wave height of all waves with periods within the inclusive range from 10 to 12 seconds  Significant wave height of all waves with periods within the inclusive range from 10 to 12 seconds, where the significant wave height is defined as 4 times the square root of the integral over all directions and all frequencies between 1/12 and 1/10 Hz of the twodimension wave spectrum  m  140114 
43r1 
H1214  Significant wave height of all waves with periods within the inclusive range from12 to 14 seconds  Significant wave height of all waves with periods within the inclusive range from 12 to 14 seconds, where the significant wave height is defined as 4 times the square root of the integral over all directions and all frequencies between 1/14 and 1/12 Hz of the twodimension wave spectrum  m  140115 
43r1 
H1417  Significant wave height of all waves with periods within the inclusive range from 14 to 17 seconds  Significant wave height of all waves with periods within the inclusive range from 14 to 17 seconds, where the significant wave height is defined as 4 times the square root of the integral over all directions and all frequencies between 1/17 and 1/14 Hz of the twodimension wave spectrum  m  140116 
43r1 
H1721  Significant wave height of all waves with periods within the inclusive range from 17 to 21 seconds  Significant wave height of all waves with periods within the inclusive range from 17 to 21 seconds, where the significant wave height is defined as 4 times the square root of the integral over all directions and all frequencies between 1/21 and 1/17 Hz of the twodimension wave spectrum  m  140117 
43r1 
H2125  Significant wave height of all waves with periods within the inclusive range from 21 to 25 seconds  Significant wave height of all waves with periods within the inclusive range from 21 to 25 seconds, where the significant wave height is defined as 4 times the square root of the integral over all directions and all frequencies between 1/25 and 1/21 Hz of the twodimension wave spectrum  m  140118 
43r1 
H2530  Significant wave height of all waves with periods within the inclusive range from 25 to 30 seconds  Significant wave height of all waves with periods within the inclusive range from 25 to 30 seconds, where the significant wave height is defined as 4 times the square root of the integral over all directions and all frequencies between 1/30 and 1/25 Hz of the twodimension wave spectrum  m  140119 
43r1 
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 period computed using the first frequency moment of the 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 windsea 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  dimensionless  140211  
PHIOC  Normalized energy flux into ocean  dimensionless  140212  
PP1D  Peak wave period  Reciprocal of the frequency corresponding to the largest value (peak) of the frequency wave spectrum. The frequency wave spectrum is obtained by integrating the twodimensional wave spectrum over all directions  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 onedimensional wave spectrum  m  140237  
SHWW  Significant height of wind waves  Significant wave height for the windsea wave spectrum  m  140234  
SH10  Significant wave height of all waves with period larger than 10s    m  140120  
SWH  Significant wave 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 swell spectrum  m  140121  
SWH2  Significant wave height of second swell partition  Significant wave height for the second most energetic partition of the swell spectrum  m  140124  
SWH3  Significant wave height of third swell partition  Significant wave height for the third most energetic partition of the swell spectrum  m  140127  
TAUOC  Normalized stress into ocean  dimensionless  140214  
TMAX  Period corresponding to maximum individual wave height  Period corresponding to maximum individual wave height  s  140217  
UST  UComponent stokes drift  Ucomponent stokes drift  m s1  140215  
VST  VComponent stokes drift  Vcomponent stokes drift  m s1  140216  
WDW  Wave spectral directional width  Directional width of the full wave spectrum  dimensionless  140222  
WEFXD  Wave energy flux mean direction  Spectral mean direction over all frequencies and direction of the product of the group velocity vector and the twodimensional energy wave spectrum.  Degree true  140113 
43r1 
WEFXM  Wave energy flux magnitude  Integral over all frequencies and directions of the product of the group speed and the twodimensional energy wave spectrum.  W/m  140112 
43r1 
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  Analysis only If requested, provided free of charge 
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 MoninObukhov length NOTE: because it is produced as a wave model output, it is only defined over the ocean 
m s**1  140208 
Page last updated: Oct 2018