GRIB-API definition

NameMinimum temperature at 2 metresAbbreviationmn2tuUnitKparamId202

 

UERRA details

DefinitionMinimum temperature at 2 metres since previous post-processing
Validityminimum since the previous post-processing
CommentPlease note that the specific height level above ground might vary from one Centre to another.

 

WMO GRIB2 definition

Parameter
Discipline0meteorological products
Parameter category0temperature
Parameter number0temperature
Type of statistical processing3minimum
Length of time rangepost-processing step in hours1/3/6
Level
Type of first fixed surface103specified height level above ground m
Scale factor of first fixed surface0 or 1***(m) or (dm***)
Scaled value of first fixed surface2 or 15***2 / 1.5 m
Type of second fixed surfaceall bits to 1
missing
Scale factor of second fixed surfaceall bits to 1missing
Scaled value of second fixed surfaceall bits to 1missing

*** option valid for MetOffice

 

4 Comments

  1. Richard Mladek

    How to specify intervals since previous post-processing?  Will they be somehow fixed or changing according to archived steps which are varying for fc/an, models etc?

  2. Richard Mladek

    The problem with the newly proposed definition "Surface air minimum temperature" with varying "Length of time range" (equal to 1 or 3 or 6) is that it would be matched sometimes to other already existing definitions. In our case for lengthOfTimeRange=6 it would be matched to paramId 122 (Minimum temperature at 2 metres in the last 6 hours). For lengthOfTimeRange=1 the definition does not exist and for lengthOfTimeRange=3 the definition exists (strangely) only for ecmf.

  3. Richard Mladek

    At the moment there is a bug in the current GRIB-API version for "Minimum temperature at 2 metres in the last 6 hours" - the "Length of time range" is not defined for WMO GRIB2 definition.

  4. Richard Mladek

    The previous version of the definition with varying period was restored. The issue with mapping will be discussed during today's (local) meeting.