# Local definition 21: Sensitive area predictions

## Local definitions

- Local definition 1
- Local definition 2
- Local definition 3
- Local definition 4
- Local definition 5
- Local definition 6
- Local definition 7
- Local definition 8
- Local definition 9
- Local definition 10
- Local definition 11
- Local definition 12
- Local definition 13
- Local definition 14
- Local definition 15
- Local definition 16
- Local definition 17
- Local definition 18
- Local definition 19
- Local definition 20
- Local definition 21
- Local definition 22
- Local definition 23
- Local definition 24
- Local definition 25
- Local definition 26
- Local definition 27
- Local definition 28
- Local definition 29
- Local definition 30
- Local definition 31
- Local definition 32
- Local definition 36
- Local definition 37
- Local definition 38
- Local definition 39
- Local definition 49
- Local definition 50
- Local definition 190
- Local definition 191
- Local definition 192

Octets | Key | Type | Contents |

41 | localDefinitionNumber | unsigned | ECMWF local GRIB use definition identifier. 21 = Sensitive area predictions. |

42 | class | codetable | Class |

43 | type | codetable | Type |

44-45 | stream | codetable | Stream |

46-49 | experimentVersionNumber | ksec1expver | Version number or experiment identifier. (4 ASCII characters, right justified) |

50-51 | forecastOrSingularVectorNumber | unsigned | Forecast number or singular vector number or flight number. Zero for analysis. |

52-93 | These elements are set to zero for type = 60 (perturbed analysis). Otherwise: | ||

52-53 | numberOfIterations | unsigned | Number of iterations. |

54-55 | numberOfSingularVectorsComputed | unsigned | Number of singular vectors computed. |

56 | normAtInitialTime | unsigned | Norm used at initial time. |

57 | normAtFinalTime | unsigned | Norm used at final time. |

58-61 | multiplicationFactorForLatLong | unsigned | Multiplication factor to convert latitude/longitude and accuracy from real to integer. |

62-65 | northWestLatitudeOfVerficationArea | signed | Latitude in degrees of north-west corner of forecast verification area multiplied by KSEC1(47). |

66-69 | northWestLongitudeOfVerficationArea | signed | Longitude in degrees of north-west corner offorecast verification area multiplied by KSEC1(47). |

70-73 | southEastLatitudeOfVerficationArea | signed | Latitude in degrees of south-east corner of forecast verification area multiplied by KSEC1(47). |

74-77 | southEastLongitudeOfVerficationArea | signed | Longitude in degrees of south-east corner of forecast verification area multiplied by KSEC1(47). |

78-81 | accuracyMultipliedByFactor | unsigned | Accuracy multiplied by KSEC1(47). |

82-83 | numberOfSingularVectorsEvolved | unsigned | Number of singular vectors evolved. |

- | Ritz numbers. RITZ = KSEC1(55)*EXP( LOG(10.0)*KSEC1(54) ) Thus: | ||

84-87 | NINT_LOG10_RITZ | signed | NINT( LOG10(RITZ)-5 ) |

88-91 | NINT_RITZ_EXP | signed | NINT( RITZ / EXP(LOG(10.0)*KSEC1(54) ) ) |

92 | optimisationTime | unsigned | For all types, this is the period in hours between the time when the targeted observations are taken (the reference time in KSEC1(10:14)) and the forecast verification time. For singular vectors, this is the optimisation time. |

93 | forecastLeadTime | unsigned | Forecast lead time (hours) For all types, this is the lead time of forecast(s) on which sensitive area prediction is based. The lead time is the time from the initialization of the forecast to the reference time in KSEC1(10:14). |

94 | marsDomain | ascii | Domain. 1 ASCII character (uppercase). |

95-96 | methodNumber | unsigned | Method number. |

97-98 | numberOfForecastsInEnsemble | unsigned | Total number of forecasts in ensemble (or zero if not appropriate). |

99 | shapeOfVerificationArea | unsigned | Shape of verification region: 0: lat-lon box as given by KSEC1(48-51) 1: circular region with centre at latitude = 0.5*(KSEC1(48)+KSEC1(50))/KSEC1(47) (deg) longitude = 0.5*(KSEC1(49)+KSEC1(51))/KSEC1(47) (deg) and with radius = 0.5*(KSEC1(48)-KSEC1(50))/(KSEC1(47)*111.199) = great-circle distance in km This is the largest circle fitting in a lat-lon box defined by KSEC1(48-51). |

100 | Spare (set to zero) |

( 1) A negative Ritz number or a negative latitude/longitude value is stored as a positive number with its most significant bit set to 1.