Ungrib issue

[LagnajeetRoy]

Hello all, i have downloaded the GFS file for a 12 days period (3 hourly) for certain variables and set a subset of a bounding box. The file i have downloaded as tar file after zipping it there are nearly 5000 grib2 files are there. Then using of ./link_grib.csh is showing :for-each too many arguments error. So what can be the possible solution let me know.

 

[Ming Chen]

Please download GFS file from NCAR RDA here, then rerun ungrib.

 

[LagnajeetRoy]

Hey, @Ming Chen i have downloaded my GFS data from that link only. I have selected the subset of data for my domain still there are total 5075 files. I have reduce the no of variables still its nearly 4000 files. I am attaching of the PDF file of the data request outcome, where there is total 18 TAR file. After untar all the file total of 5075 grib2 files are coming. Its a large no.

 

[Ming Chen]

Please take a look at those .tar files you downloaded and let me know what files are included.

Note that GFS data posted in the RDA website for public download contains both analysis and forecast products. Users need to choose data based on their specific need. It is not recommended and not necessary to download all the files.

 

[LagnajeetRoy]

Hello, i have check the data in that section where the analysis and forecast for every hour, accumulation are present. I want to run forecast data in WRF. Only downloading the analysis data will have a less number of files but downloading all the forecast files taking it to 4000 file numbers. Please let me know for the GFS run what file should i download?

 

[Ming Chen]

If you run WRF for hindcast, I would suggest you start from the GFS analysis products, which are at 6-hour intervals. For WRF run, the boundary update at 6-hour is sufficient.

If you intend to run WRF for real-time weather forecast, you will have to obtain forecast data. Suppose you initialize your forecast at 00 UTC, then you will need to get GFS real-time forecast data at 00, 03,06, 09, etc.