The following fields are monthly means 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.

1.1 Parameters

V-i-a) Single level parameters

10 metre U-velocity (10U)
10 metre V-velocity (10V)
2 metre temperature (2T)
2 metre dewpoint temperature (2D)
Land/sea mask (LSM)
Maximum temperature at 2 metres in the last 24 hours (MX2T24)
Mean sea level pressure (MSL)
Minimum temperature at 2 metres in the last 24 hours (MN2T24)
Orography (Z)
Sea surface temperature (SSTK)
Snow depth (SD)
Soil temperature level 1 (STL1)
Total precipitation (TP)

If requested by the user, the land-sea mask (LSM) and the model orography (Z) will be provided free of charge once with every forecast dissemination.

V-i-b) Pressure-level parameters

At levels 1000, 925, 850, 700, 500, 400, 300, 200 hPa:
- Geopotential height (GH)
- U-velocity (U)
- V-velocity (V)
- Temperature (T)

See appendix for definition and units of the monthly mean parameters given above.

1.2 Product resolution

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)

1.3 Forecast ranges

1 to 7 months

1.4 Base times

00 UTC

V-ii: Monthly mean anomalies of ensemble means

The following products correspond to the products in section V-i with the model climate mean subtracted. The model climate is derived from hindcast statistics. The fields are provided in GRIB code.

2.1 Parameters

V-ii-a) Single level parameters

10 metre U-velocity anomaly (10UA)
10 metre V-velocity anomaly (10VA)
2 metre temperature anomaly (2TA)
2 metre dewpoint temperature anomaly (2DA)
Land/sea mask (LSM)
Maximum temperature at 2 metres in the last 24 hours anomaly (MX2T24A)
Mean sea level pressure anomaly (MSLA)
Minimum temperature at 2 metres in the last 24 hours anomaly (MN2T24A)
Orography (Z)
Sea surface temperature anomaly (SSTAK)
Snow depth anomaly (SDA)
Soil temperature anomaly level 1 (STAL1)
Total precipitation anomalous rate of accumulation (TPARA)

If requested, the following parameters can be provided free of charge once with every forecast dissemination.

Land-sea mask (LSM)
Model orography (Z)

V-ii-b) Pressure-level parameters

At levels 1000, 925, 850, 700, 500, 400, 300, 200 hPa:
- Geopotential height anomaly (GHA)
- U-velocity anomaly (UA)
- V-velocity anomaly (VA)
- Temperature anomaly (TA)

See appendix for definition and units of the monthly mean parameters given above.

2.2 Product resolution

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)

2.3 Forecast ranges

1 to 7 months

2.4 Base times

00 UTC

V-iii: Monthly means of individual ensemble member forecasts

The following fields are monthly means computed from data of the daily individual forecast runs (section V-v) for the individual ensemble members. The fields are provided in GRIB code. The product contains the equivalent monthly means of ensemble means (V-i).

3.1 Parameters

V-iii-a) Single level parameters

10 metre U-velocity (10U)
10 metre V-velocity (10V)
2 metre temperature (2T)
2 metre dewpoint temperature (2D)
Land/sea mask (LSM)
Maximum temperature at 2 metres in the last 24 hours (MX2T24)
Mean sea level pressure (MSL)
Minimum temperature at 2 metres in the last 24 hours (MN2T24)
Orography (Z)
Sea surface temperature (SSTK)
Snow depth (SD)
Soil temperature level 1 (STL1)
Total precipitation (TP)
Volumetric soil water layer 1 (SWVL1)

If requested, the following parameters can be provided free of charge once with every forecast dissemination.

Land-sea mask (LSM)
Model orography (Z)

V-iii-b) Pressure-level parameters

At levels 1000, 925, 850, 700, 500, 400, 300, 200 hPa:
- Geopotential height (GH)
- U-velocity (U)
- V-velocity (V)
- Temperature (T)

See appendix for definition and units of the monthly mean parameters given above.

3.2 Product resolution

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)

3.3 Forecast ranges

1 to 7 months

3.4 Base times

00 UTC

V-iv: Monthly mean anomalies of individual ensemble member forecasts

The following products correspond to the products in section V-iii with the model climate mean subtracted. The model climate is derived from hindcast statistics. The fields are provided in GRIB code. The product contains the equivalent monthly mean anomalies of ensemble means (V-ii).

4.1 Parameters

V-iv-a) Single level parameters

10 metre U-velocity anomaly (10UA)
10 metre V-velocity anomaly (10VA)
2 metre temperature anomaly (2TA)
2 metre dewpoint temperature anomaly (2DA)
Land/sea mask (LSM)
Maximum temperature at 2 metres in the last 24 hours anomaly (MX2T24A)
Mean sea level pressure anomaly (MSLA)
Minimum temperature at 2 metres in the last 24 hours anomaly (MN2T24A)
Orography (Z)
Sea surface temperature anomaly (SSTAK)
Snow depth anomaly (SDA)
Soil temperature anomaly level 1 (STAL1)
Total precipitation anomalous rate of accumulation (TPARA)

If requested by the user, the land-sea mask (LSM) and the model orography (Z) will be provided free of charge once with every forecast dissemination.

V-iv-b) Pressure-level parameters

At levels 1000, 925, 850, 700, 500, 400, 300, 200 hPa:
- Geopotential height anomaly (GHA)
- U-velocity anomaly (UA)
- V-velocity anomaly (VA)
- Temperature anomaly (TA)

See appendix for definition and units of the monthly mean parameters given above.

4.2 Product resolution

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)

4.3 Forecast ranges

1 to 7 months

4.4 Base times

00 UTC

V-v: Individual forecast runs (daily real-time)

The products contain values for each ensemble member of the Seasonal Prediction System. The fields are provided in GRIB code.

5.1 Parameters

V-v-a) Single level parameters (6 hourly products)

10 metre U-velocity (10U)
10 metre V-velocity (10V)
2 metre temperature (2T)
2 metre dewpoint temperature (2D)
Mean sea level pressure (MSL)

The products contain values for write-up times 00, 06, 12 and 18 UTC.

V-v-b) Single level parameters (24 hourly products)

Land/sea mask (LSM)
Maximum temperature at 2 metres in the last 24 hours (MX2T24)
Mean 2m temperature in the past 24 hours (MEAN2T24)
Minimum temperature at 2 metres in the last 24 hours (MN2T24)
Orography (Z)
Snow depth (SD)
Sea surface temperature (SSTK)
Soil temperature level 1 (STL1)
Soil temperature level 2 (STL2)
Soil temperature level 3 (STL3)
Soil temperature level 4 (STL4)
Solar surface radiation downwards (SSRD)
Total column water vapour (TCWV)
Total precipitation (TP)
Volumetric soil water layer 1 (SWVL1)
Volumetric soil water layer 2 (SWVL2)
Volumetric soil water layer 3 (SWVL3)
Volumetric soil water layer 4 (SWVL4)

The products contain values for write-up times 00 UTC.

V-v-c) Pressure-level parameters (12 hourly products)

At levels 1000, 925, 850, 700, 500, 400, 300, 200 hPa:
- Geopotential height (GH)
- U-velocity (U)
- V-velocity (V)
- Temperature (T)

The products contain values for write-up time 00 and 12 UTC.

If requested, the following parameters can be provided free of charge once with every forecast dissemination.

Land-sea mask (LSM)
Model orography (Z)

5.2 Product resolution

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)

5.3 Forecast time-steps

T+0h to T+5160h at 6-hour intervals for V-v-a)

T+0h to T+5160h at 24-hour intervals for V-v-b)

T+0h to T+5160h at 12-hour intervals for V-v-c)

5.4 Base times

00 UTC

Appendix

A.1 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).

23-03-2006