GRIB section 1 definition for Seasonal Forecast System 3 data

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Description of System 3

Re-forecasts and pre-operational data

Seasonal forecast dissemination products

Seasonal Forecasting System 3 dissemination requirements

Seasonal forecast monthly means and monthly mean anomaly dissemination products

GRIB section 1 definition for Seasonal Forecast System 3 data

Transmission of Seasonal Forecasting System products

9.8.1 Seasonal forecast data (STREAM=MMSF)

By convention, ECMWF always uses octet 41 to define which set of local definitions follow. The set of local definitions for Seasonal forecast fields:

Table 10.2 GRIB section 1 definition for Seasonal Forecast products

Octet

Ksec1

element

Contents

ECMWF local GRIB use definition identifier.

15 = Seasonal forecast data

Class:

1 = Operations

Type:

9 = Forecast

44-45

46-49

Stream:

1090 = ECMWF ensemble seasonal forecasts

Version number or experiment identifier.

(4 ASCII characters, right justified)

50-51

Number ( Ensemble forecast number: 0)

56-57

Total number of forecasts in ensemble.

52-53

System number

The "scientific version" number.

0 = RD experiment

1 - 65534 = operational version number

65535 = missing

54-55

Method number

Distinguishes scientifically different forecast ensembles

(e.g. different calibration/bias correction)

0 = control integration (i.e. without data assimilation)

1 - 65534 = operational version number

Spare (set to zero)

9.8.2 Seasonal forecast monthly means and monthly mean anomaly dissemination data (STREAM=MSMM/MMSA)

By convention, ECMWF always uses octet 41 to define which set of local definitions follow. The set of local definitions for Seasonal forecast fields:

Table 10.3 GRIB section 1 definition for Seasonal monthly means and monthly means anomalies products

Octet	Ksec1 element	Contents
41 42 43	37 38 39	ECMWF local GRIB use definition identifier. 16 = ECMWF seasonal forecast monthly mean data Class: 1 = Operations Type: 17 = Ensemble means 80 = Forecast seasonal mean 81 = Forecast seasonal maximum 82 = Forecast seasonal minimum 83 = Forecast seasonal standard deviation
44-45 46-49	40 41	Stream: 1221 = ECMWF seasonal forecast monthly means 1224 = Seasonal monthly means anomalies Version number or experiment identifier. (4 ASCII characters, right justified)
50-51	42	Number ( Ensemble forecast number: 0)
-	43	Zero
52-53	44	System number The "scientific version" number. 0 = RD experiment 1 - 65534 = operational version number 65535 = missing
54-55	45	Method number Distinguishes scientifically different forecast ensembles (e.g. different calibration/bias correction) 0 = control integration (i.e. without data assimilation) 1 - 65534 = operational version number
56-59	46	Verifying month (in format YYYYMM)
60	47	Averaging period (e.g. 6-hour, 24-hour)
61-62	48	Forecast month
63-80	-	Spare (set to zero)

08-02-2010