KSEC1 element Contents GRIB octet Recommended GRIB_API key Coded GRIB_API keys Comments

37
ECMWF local GRIB use definition identifier.
23 = Coupled atmospheric, wave and ocean models (with hindcast support)
41 localDefinitionNumber localDefinitionNumber

38 Class 42 class marsClass

39 Type 43 type marsType

40 Stream 44-45 stream
marsStream

41
Version number or experiment identifier.
(4 ASCII characters, right justified)
46-49 expver
experimentVersionNumber

42
Ensemble member number.
Control forecast is number 0, perturbed forecasts are 1-nn.
50-51 number
perturbationNumber

43 Number of forecasts in ensemble 81-82

44
System number: the "scientific version" number.
0 = RD experiment
1 - 65534 = operational version number
65535 = missing
52-53 system
systemNumber

45
Method number
Distinguishes scientifically different forecast ensembles
(eg different calibration/bias correction)
0 = control integration (ie without data assimilation)
1 - 65534 = operational version number
54-55 method
methodNumber

46 Verifying month (in format YYYYMM), or period used for mean (dddDDD for period from time ddd to time DDD) 56-59 verifyingMonth
verifyingMonth

47 Averaging period (eg 6-hour, 24-hour) 60 averagingPeriod
averagingPeriod

48 Forecast month 61-62 forecastMonth
forecastMonth

49 Reference date (YYYYMMDD) 63-66 refdate
referenceDate

50 Climate date - from (YYYYMMDD) 67-70 climateDateFrom
climateDateFrom

51 Climate date - to (YYYYMMDD) 71-74 climateDateTo
climateDateTo

52-59 Probability information 75-84

52 Threshold units decimal scale factor.
+ or - power of 10 (or zero).
Most significant bit = 1 for negative values. 75 unitsDecimalScaleFactor
unitsDecimalScaleFactor

53 Threshold indicator:
1 = Only lower threshold is present.
2 = Only upper threshold is present.
3 = Both upper and lower thresholds are present. 76 thresholdIndicator
thresholdIndicator

54 Lower threshold value. 77-78 lowerThresholdValue
lowerThresholdValue

55 Upper threshold value. 79-80 upperThresholdValue
upperThresholdValue

56-59 Spare (set to zero) 83-84

KSEC1 element	Contents	GRIB octet	Recommended GRIB_API key	Coded GRIB_API keys
37	ECMWF local GRIB use definition identifier. 23 = Coupled atmospheric, wave and ocean models (with hindcast support)	41	localDefinitionNumber	localDefinitionNumber
38	Class	42	class	marsClass
39	Type	43	type	marsType
40	Stream	44-45	stream	marsStream
41	Version number or experiment identifier. (4 ASCII characters, right justified)	46-49	expver	experimentVersionNumber
42	Ensemble member number. Control forecast is number 0, perturbed forecasts are 1-nn.	50-51	number	perturbationNumber
43	Number of forecasts in ensemble	81-82
44	System number: the "scientific version" number. 0 = RD experiment 1 - 65534 = operational version number 65535 = missing	52-53	system	systemNumber
45	Method number Distinguishes scientifically different forecast ensembles (eg different calibration/bias correction) 0 = control integration (ie without data assimilation) 1 - 65534 = operational version number	54-55	method	methodNumber
46	Verifying month (in format YYYYMM), or period used for mean (dddDDD for period from time ddd to time DDD)	56-59	verifyingMonth	verifyingMonth
47	Averaging period (eg 6-hour, 24-hour)	60	averagingPeriod	averagingPeriod
48	Forecast month	61-62	forecastMonth	forecastMonth
49	Reference date (YYYYMMDD)	63-66	refdate	referenceDate
50	Climate date - from (YYYYMMDD)	67-70	climateDateFrom	climateDateFrom
51	Climate date - to (YYYYMMDD)	71-74	climateDateTo	climateDateTo
52-59	Probability information	75-84
52	Threshold units decimal scale factor. + or - power of 10 (or zero). Most significant bit = 1 for negative values.	75	unitsDecimalScaleFactor	unitsDecimalScaleFactor
53	Threshold indicator: 1 = Only lower threshold is present. 2 = Only upper threshold is present. 3 = Both upper and lower thresholds are present.	76	thresholdIndicator	thresholdIndicator
54	Lower threshold value.	77-78	lowerThresholdValue	lowerThresholdValue
55	Upper threshold value.	79-80	upperThresholdValue	upperThresholdValue
56-59	Spare (set to zero)	83-84