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Home > Services > Dissemination > 3.1 > Meteorological Bulletin M3.1 > Ensemble Prediction System > 
 Extreme forecast index data  TROPICAL CYCLONE trajectory forecast products  
   

EPS Weather Parameter products

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EPS Dissemination requirements
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Transmission of EPS products
 
 

The EPS WEATHER PARAMETER products in the form of time series of a specific parameter for a number of forecasts at the user defined location are available from the ECMWF dissemination system. Data is presented in the FM 94-IX Ext. BUFR binary representation (BUFR Edition 3 is used).

 

Each EPS WEATHER PARAMETER product contains 51 data subsets. Each subset represents data time series for a particular forecast: EPS control forecast and each of the 50 EPS T639 (for forecast range 0-240 hours) and T319 (for time steps 246-360 hours) perturbed forecasts. WEATHER PARAMETER forecast time steps range from 0 to 240 or 360 hours by steps of 12, 6 or 3 hours (3 hourly intervals are available up to forecast step 144 and then the values are taken 6 hourly to T+240 or T+360).

 

The data for the WEATHER PARAMETER products is constructed from the basic model grid used for producing many of the standard dissemination fields. Where the requested location coordinates coincide with the original field grid point location, the grid point value will be

taken. Otherwise, the value at the requested location will be obtained by bi-linear interpolation from the four nearest original field grid points.

 

When requesting data at grid point location note the following:

 

- upper air fields are converted from spherical harmonics to 0.25/0.25 (leg 1) and 0.5/0.5 (leg 2) degrees latitude/longitude grid before extraction/interpolation to requested location;

 

- surface fields out of EPS T639 forecasts (control and perturbed) are represented on N320 reduced Gaussian grid whereas surface fields out of EPS T319 forecasts (VarEPS leg 2) are represented on N160 reduced Gaussian grid;

 

A number of parameters have been made available for dissemination in the form of WEATHER PARAMETER products. The system has been made fully flexible, so that any combination of parameters/levels/locations can be requested. Parameters available are listed in the Table 5.10 below.

 

* Orography is defined as Geopotential on level surface

** On pressure levels 1000, 850, 700, 500 and 200 hPa. See note below for time range availability

*** WP Sunshine duration are not accumulated values but values since previous time step specified in the message

++ Takes into account time step frequency requested and generates fields accordingly

Table 5.10 EPS WEATHER PARAMETER products

FIELD CODE

MARS ABBREV.

FIELD NAME

UNITS

49

10FG

Wind gust at 10 meters ++

m/s

59

 

CAPE

 

Convective available potential

energy

J/K

 

129

Z

Geopotential** *

m2s-2

130

T

Temperature**

K

131

U

U-velocity**

m/s

132

V

V-velocity**

m/s

142

LSP

Large scale precipitation

m

143

CP

Convective precipitation

m

157

R

Relative humidity**

-

228

TP

Total Precipitation

kg/m**2

164

TCC

Total Cloud Cover

(0-1)

167

2T

2 Metre Temperature

K

168

2D

2 Metre Dew Point Temperature

K

165

10U

10 Metre U Wind Component

m/s

166

10V

10 Metre V Wind Component

m/s

144

SF

Snow fall

m

201

 

MX2T

 

Max. temp. at 2m since prev. post-processing ++

K

 

202

 

MN2T

 

Min. temp. at 2m since prev. post-processing ++

K

 

172

LSM

Land/sea mask

(0-1)

151

MSL

Mean sea level pressure

Pa

189

SUND

Sunshine duration***

min

 

 

NOTE: WEATHER PARAMETER products are generated on either 3, 6 or 12 hour intervals (0 to 240 or 0 to 360). The following products are available only at 12 hour intervals:

- Geopotential on pressure levels 1000, 700 and 200 hPa

- Temperature on pressure levels 1000, 700 and 200 hPa

- U-velocity, V-velocity and Relative humidity on pressure levels 1000, 850, 700, 500 and 200 hPa.

 

EPS WEATHER PARAMETER products are disseminated separately from other EPS products and have their own dissemination schedule (Table 5.14 below).

EPS Weather Parameter requirements

The following command language parameters are specific for the WEATHER PARAMETER requirements. Other parameters are listed under the general EPS requirements above.

 

STREAM

=

ENSEMBLE FORECAST

[EF]

TYPE

=

WEATHER PARAMETER

[WP]

DOMAIN

=

GLOBAL

[G]

FORMAT

=

BUFR

[BF]

LEVTYPE

 

=

 

PRESSURE LEVEL

SURFACE

[PL]

[SFC]

LEVELIST

 

=

100/850/700/500/200

OFF

(PARAM=Z /T/U/V/R only)

(Surface parameters)

AREA

 

 

 

=

 

 

 

a/b (latitude-longitude grid)

 

a = latitude of location (degrees);

b = longitude of location (degrees);

STEP

 

 

 

 

 

 

 

 

 

=

 

 

 

 

 

 

 

 

 

* (hours)

gives range of forecast time steps (see note above for each parameter/level availability);

 

240 (will result in 3 hourly values to T+144 and 6 hourly to T+240)

0/to/240/by/6

0/to/240/by/12

360 (will result in 3 hourly values to T+144 and 6 hourly to T+360)

0/to/360/by/6

0/to/360/by/12

PARAM

 

 

 

=

 

 

 

Field name abbreviation

*

NB ALL is not permitted.

Available parameters are listed in the Table 5.10.


BUFR definition for WEATHER PARAMETER products

ECMWF's EPS WEATHER PARAMETER products are presented in the FM 94-IX Ext. BUFR binary representation form. Products are coded into BUFR Edition 3. They contain the following:

 

    • Table 5.11 BUFR table reference for EPS WEATHER PARAMETER products

    Table D

    Reference

    Table B

    Reference

    Element

    Name

     

     

    008195

    005195

    Data Type

    Ensemble Member Number

    301011

     

     

     

    004001

    004002

    004003

    004004

    Year

    Month

    Day

    Hour

    301021

     

     

     

     

     

     

     

    005001

    006001

     

    007004

     

    007007

     

    Latitude

    Longitude

     

    Pressure data (Element present only for upper air

    parameters)

    Height (10 m) (Element present only for 10U/10V

    parameter)

     

     

     

     

     

     

     

     

    102nnn

     

     

     

     

     

    004024

    Repeat 2 elements `nnn' times

    240 data set (21 - 12hourly data set, 41 - 6 hourly data set or 65 - 3 hourly data set)

    360 data set (31 - 12hourly data set, 61 - 6 hourly data set or 85 - 3 hourly data set)

     

    Time period or displacement (hours)

    (forecast time step)

     

     

      • Table 5.11-2 BUFR table reference for EPS WEATHER PARAMETER products

      Table reference

      List of parameters available

      Element

      Name

      012001

      010003

      011003

      011004

      020010

      Temperature

      Geopotential

      U-component

      V-component

      Cloud cover (total)

      013011

      012004

      012006

      013233

      012199

      Total precipitation

      Dry-bulb temperature at 2m

      Dew-point temperature at 2m

      Fraction of total precipitation in solid form (snow)

      Maximum temperature at 2m, past 6 hours

      012200

      008224

      010001

      013230

      013231

      011041

      010051

      014034

      013241

      Minimum temperature at 2m, past 6 hours

      Land/sea mask

      Height of Land Surface

      Convective precipitation

      Large scale precipitation

      Maximum wind speed - gust

      Pressure reduced to mean sea level

      Sunshine over period specified

      Convective available potential energy

       

      Each BUFR message for EPS WEATHER PARAMETER data conforms to the above data description and contains 51 data subsets. Each subset represents data time series for a

      particular forecast: EPS control forecast and each of the 50 EPS perturbed forecasts.

       

      Please, note that two new entries have been added to the BUFR table B:

       

      1 008195 DATA TYPE CODE TABLE 08195

      2 005195 ENSEMBLE MEMBER NUMBER NUMERIC

       

      DATA TYPE code entries (as defined in the code table 08195 and used for WEATHER PARAMETER products):

       

      10 = Control forecast

      11 = Perturbed forecast

       

      ENSEMBLE MEMBER NUMBER values (as used for WEATHER PARAMETER products):

       

      0 = operational T1279 forecast/EPS control forecast

      n = EPS perturbed forecast (n = 1 - 50)

       

      Users have to update their tables accordingly. Tables are also available from ECMWF.




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