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Output WRF data in grib?

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T

tpartrid

New member
Hello all,

Is it possible to save WRF output data in a grib format instead of NetCDF?

If not, does anyone know of a way to convert from NetCDF to grib?

Thanks!
Trevor
 
Hi Trevor,
Theoretically, there is a namelist option that can be used for outputting data in GRIB1 or GRIB2 format. You would just set:
io_form_history = 5 (GRIB1)
io_form_history = 10 (GRIB2)

However, I'm not sure if either of these options actually work. In the past we were aware that at least the GRIB2 option was not working properly, and I don't believe any modifications have been made to correct the problem. Someone recently claimed that they were able to get the GRIB1 option to work, but I cannot say for sure whether this will work.

There is a utility that will convert from GRIB format to NetCDF format. I'm not sure how difficult it would be to configure the utility to convert the other way, but it may be worth a look:
http://www.ncl.ucar.edu/Document/Tools/ncl_convert2nc.shtml

There may be other tools available somewhere, but I'm unaware of them. If you do find something, please update this post so that users in the future can use it. Thanks!
 
Thanks for the help kwerner!

I have tried setting io_form_history = 10, but that was unsuccessful (I'm running WRF V4.0.1). I'll try setting it to 5 and update the thread.

Since posting I've come across the Climate Data Operator (cdo) tool, which is apparently capable of converting from NetCDF to GRIB. However, I haven't fully tested it yet.

Trevor
 
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