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In forecast mode the selected steps of a given forecast can be used for data generation. If the mode is set to period a period with a start and end date and constant time-step can be defined. In this case FLEXTRA Prepare tries to retrieve analysis fields from MARS whenever it is possible (for dates in the past) and uses forecast fields otherwise (for dates in the future).
Input
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Source
Specifies the source of the input GRIB data. The possible values are: mars and file.The default value is mars.
If the input source is mars the input GRIB data is retrieved from the MARS archive. When Prepare modeMode is forecast the input source can also be set to file. In this case the GRIB file specified in Input fileFile will be used as input data.
Input
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File
Specifies the full path to the file containing the input GRIB data. Available when Prepare modeMode is forecast and Input sourceSource is file. The input file must contain the following fields:
| Filed type | Parameters | Forecast steps (defined in StepsStep) |
|---|---|---|
| surface fields | ["sd","msl","tcc","10u","10v","2t","2d","sp", "z","lsm","lcc","mcc","hcc","skt", "stl1","swvl1"] | all |
| surface fluxes | ["lsp","cp","sshf","ewss","nsss","ssr"] | all + additional steps (see the comment note below) |
| model level fields | ["u","v","t","q","etadot"] | all |
| surface analysis | ["sdor","cvl","cvh","sr"] | required for the valid date of step 0 |
| Note |
|---|
The surface fluxes are accumulated fields and for the de-accumulation process they also require the step preceding the first step. We have a special case when the first step is 0 because in this case we need two additional steps but from the previous model run! E.g. for a 0 UTC model run when we use 3 hourly steps we need the fluxes from step=6 and step=3 of the 18 UTC run on the previous day. |
Date
Specifies the run date of the forecast. Available when Prepare Mode is forecast.
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