SEAS comprises ensembles of individual forecasts coupled to an ocean model and post-processed products of average conditions (e.g. monthly averages) with the associated uncertainty. Products are available up to 7 months ahead.

The following sub-sets are available:

V-i: Monthly means of ensemble means

Field computed from data of the daily individual forecast runs (section V-v) and averaged over all ensemble members. The fields are provided in GRIB code.

V-ii: Monthly mean anomalies of ensemble means

V-iii: Monthly means of individual ensemble members

V-iv: Monthly mean anomalies of individual ensemble members

V-v: Individual forecast runs

Definition of the monthly fields

The definition of the month is in accordance to the calendar month of the western calendar

  • Monthly means are computed using values at write-up times 00, 06, 12 and 18 UTC for
    • 2m temperature (K)
    • 10m U-velocity (m/s)
    • 10m V-velocity (m/s)
    • MSLP (Pa)
  • Monthly means are computed using values at write-up times 00 and 12 UTC for
    • Pressure-level parameters
  • Monthly means are computed using values at the write-up time 00 for
    • Sea surface temperature (K)
    • Soil temperature level 1 (K)
    • Volumetric soil water layer 1 (m**3 m**-3)
  • Monthly mean total precipitation (m/s) is the rate of precipitation during the month.
  • Maximum temperature at 2 meters (K) is the monthly mean of the maximum of MX2T (Maximum temperature at 2 meter since last post-processing).
  • Minimum temperature at 2 meters (K) is the monthly mean of the minimum of MN2T (Minimum temperature at 2 meters since last post-processing).

Dissemination schedule

Forecast time Time available
Forecast month 1-7 8th of each month 12:00 UTC

Parameters

V-i: Monthly means of ensemble means

Forecast ranges & resolution

Ranges Base times Resolution
1 to 7 month 00 UTC
  • 0.75° x 0.75° lat/long grid or any multiple thereof (global or sub-area)
  • On model (Gaussian) N128 grid (global or sub-area)
  • Spectral components (T255) for upper-air fields (global area only)

V-i-a Single level

Short name Long name Unit ID Additional information
10U  10 metre U-velocity  m s-1  165  
10V  10 metre V-velocity  m s-1  166  
2D  2 metre dewpoint temperature  K  168  
2T  2 metre temperature  K  167  
LSM (inv) Land/sea mask  (0, 1)  172 provided free of charge once with every forecast dissemination
MN2T24  Minimum temperature at 2m in the last 24 hours  K  52  
MSL  Mean sea level pressure  Pa  151  
MX2T24     K  51  
RSN  Snow density  kg m**-3  33 New to catalogue
SD  Snow depth  m of equi 141  
SSTK  Sea surface temperature  K  34  
STL1  Soil temperature level 1  K  139  
TP  Total precipitation  m of equi 228  
Z (inv) Orography  m2 s-2  129 provided free of charge once with every forecast dissemination

V-i-b Pressure levels

Available levels 1000, 925, 850, 700, 500, 400, 300, 200 hPa

Short name Long name Unit ID Additional information
GH Geopotential height m 156  
T Temperature K 130  
U U-velocity m s-1 131  
V V-velocity m s-1 132  

V-ii: Monthly mean anomalies of ensemble means

Ranges Forecast time step Base times Resolution
1 to 7 month 6-hourly 00 UTC
  • 0.75° x 0.75° lat/long grid or any multiple thereof (global or sub-area)
  • On model (Gaussian) N128 grid (global or sub-area)
  • Spectral components (T255) for upper-air fields (global area only)

V-ii-a Single level

Short name Long name Unit ID Additional information
10UA 10 metre U wind component anomaly m s-1 171165  
10VA 10 metre V wind component anomaly m s-1 171166  
2DA 2 metre dewpoint temperature anomaly K 171168  
2TA 2 metre temperature anomaly K 171167  
LSM(inv) Land/sea mask (0, 1) 172 provided free of charge once with every forecast dissemination
MN2T24A Minimum 2 metre temperature in the last 24 hours anomaly K 171052  
MSLA Mean sea level pressure anomaly Pa 171151  
MX2T24A Maximum 2 metre temperature in the last 24 hours anomaly K 171051  
RSNA Snow density anomaly kg m**-3 171033 New to catalogue
SDA Snow depth anomaly m of water equivalent 171141  
SSTA Sea surface temperature anomaly K 171034  
STAL1 Soil temperature anomaly level 1 K 171139  
TPARA Total precipitation anomalous rate of accumulation m s-1 173228  
Z(inv) Orography m2 s-2 129 provided free of charge once with every forecast dissemination

V-ii-b Pressure levels

short name Long name Unit  ID Additional information
GHA Height anomaly m 171156  
TA Temperature K 3025  
UA U component of wind anomaly m s-1 171131  
VA V component of wind anomaly m s-1 171132  

V-iii: Monthly means of individual ensemble members

Ranges Forecast time step Base times Resolution
1 to 7 month 6-hourly 00 UTC
  • 0.75° x 0.75° lat/long grid or any multiple thereof (global or sub-area)
  • On model (Gaussian) N128 grid (global or sub-area)
  • Spectral components (T255) for upper-air fields (global area only)

V-iii-a Single level

Short name Long name Unit ID Additional information
10U 10 metre U-velocity m s-1 165  
10V 10 metre V-velocity m s-1 166  
2D 2 metre dewpoint temperature K 168  
2T 2 metre temperature K 167  
LSM(inv) Land/sea mask (0, 1) 172 provided free of charge once with every forecast dissemination
MN2T24 Minimum temperature at 2m in the last 24 hours K 52  
MSL Mean sea level pressure Pa 151  
MX2T24 Maximum temperature at 2m in the last 24 hours K 51  
RSN Snow density kg m**-3 33 New to catalogue
SD Snow depth m of equivalent water 141  
SSTK Sea surface temperature K 34  
STL1 Soil temperature level 1 K 139  
SWVL1 Volumetric soil water layer 1 m3 m-3 39  
TP Total precipitation m of equivalent water 228  
Z(inv) Orography m2 s-2 129 provided free of charge once with every forecast dissemination

V-iii-b Pressure levels

Available at 1000, 925, 850, 700, 500, 400, 300, 200 hPa unless otherwise specified.

Short name Long name Unit  ID Additional information
GH Geopotential height m 156  
T Temperature K 130  
U U-velocity m s-1 131  
V V-velocity m s-1 132  

V-iv: Monthly mean anomalies of individual ensemble members

Ranges Forecast time step Base times Resolution
1 to 7 month 6-hourly 00 UTC
  • 0.75° x 0.75° lat/long grid or any multiple thereof (global or sub-area)
  • On model (Gaussian) N128 grid (global or sub-area)
  • Spectral components (T255) for upper-air fields (global area only)

V-iv-a Single level

Short name Long name Unit ID Additional information
10UA 10 metre U wind component anomaly m s**-1 171165  
10VA 10 metre V wind component anomaly m s**-1 171166  
2DA 2 metre dewpoint temperature anomaly K 171168  
2TA 2 metre temperature anomaly K 171167  
LSM(inv) Land/sea mask (0, 1) 172 provided free of charge once with every forecast dissemination
MN2T24A Minimum 2 metre temperature in the last 24 hours anomaly K 171052  
MSLA Mean sea level pressure anomaly Pa 171151  
MX2T24A Maximum 2 metre temperature in the last 24 hours anomaly K 171051  
RSNA Snow density anomaly kg m**-3 171033 New to catalogue
SDA Snow depth anomaly m of water equivalent 171141  
SSTA Sea surface temperature anomaly K  
STAL1 Soil temperature anomaly level 1 K 171139  
TPARA Total precipitation anomalous rate of accumulation m s-1 173228  
Z(inv) Orography m2 s-2 129 provided free of charge once with every forecast dissemination

V-iv-b Pressure levels

Available at 1000, 925, 850, 700, 500, 400, 300, 200 hPa unless otherwise specified.

Short name Long name Unit  ID Additional information
GHA Height anomaly m 171156  
TA Temperature K 3025  
UA U component of wind anomaly m s-1 171131  
VA V component of wind anomaly m s-1 171132  

V-v: Individual forecast runs

V-v-a Single level - 6-hourly

Ranges Forecast time step Base times Resolution
T+0h to T+5160h 6-hourly 00 UTC
  • 0.75° x 0.75° lat/long grid or any multiple thereof (global or sub-area)
  • On model (Gaussian) N128 grid (global or sub-area)
  • Spectral components (T255) for upper-air fields (global area only)
Short name Long name Unit  ID Additional information
10U 10 metre U-velocity m s-1 165  
10V 10 metre V-velocity m s-1 166  
2D 2 metre dewpoint temperature K 168  
2T   2 metre temperature K 167  
MSL Mean sea level pressure Pa 151  

V-v-b Single level 24-hourly

Ranges Forecast time step Base times Resolution
T+0h to T+5160h 24-hourly 00 UTC
  • 0.75° x 0.75° lat/long grid or any multiple thereof (global or sub-area)
  • On model (Gaussian) N128 grid (global or sub-area)
  • Spectral components (T255) for upper-air fields (global area only)
Short name Long name Unit ID Additional information
CP Convective precipitation m 143  
EWSS Eastward turbulent surface stress Nm**-2 180  
LSM (inv) Land/sea mask (0, 1) 172 provided free of charge once with every forecast dissemination
MEAN2T24 Mean temperature at 2 metres in the last 24 hours K 55  
MN2T24 Minimum temperature at 2m in the last 24 hours K 52  
MX2T24 Maximum temperature at 2m in the last 24 hours K 51  
NSSS Northward turbulent surface stress Nm**-2 181  
RSN Snow density kg m**-3 33 New to catalogue
SD Snow depth m of equivalent water 141  
SSRD Surface solar radiation downwards J m-2 169  
SSTK Sea surface temperature K 34  
STL1 Soil temperature level 1 K 139  
STL2 Soil temperature level 2 K 170  
STL3 Soil temperature level 3 K 183  
STL4 Soil temperature level 4 K 236  
SRO Surface runoff m 8  
SSRO Sub-surface runoff m 9

 
STRD Surface thermal radiation downwards J m-2 175

 
SWVL1 Volumetric soil water layer 1 m3 m-3 39  
SWVL2 Volumetric soil water layer 2 m3 m-3 40  
SWVL3 Volumetric soil water layer 3 m3 m-3 41  
SWVL4 Volumetric soil water layer 4 m3 m-3 42  
TCWV Total column water vapour kg m-2 137  
TP Total precipitation m of equivalent water 228  
Z (inv) Orography m2 s-2 129 provided free of charge once with every forecast dissemination

V-v-c Pressure levels 12-houlry

Available at 1000, 925, 850, 700, 500, 400, 300, 200 hPa unless otherwise specified.

Ranges Forecast time step Base times Resolution
T+0h to T+5160h 12-hourly 00 UTC
  • 0.75° x 0.75° lat/long grid or any multiple thereof (global or sub-area)
  • On model (Gaussian) N128 grid (global or sub-area)
  • Spectral components (T255) for upper-air fields (global area only)
Short name Long name Unit  ID Additional information
GH Geopotential height m 156  
T Temperature K 130  
U U-velocity m s-1 131  
V V-velocity m s-1 132  

Last updated 27-04-2016