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by kwerner
Fri Jan 15, 2021 6:00 pm
Forum: High-performance Computing
Topic: wrf.exe keeps running without any progress when increasing the number of processors
Replies: 2
Views: 9

Re: wrf.exe keeps running without any progress when increasing the number of processors

Hi Xinxu, To explain the problem you're seeing, I would focus more on the first part of the FAQ question you mention. We have a basic rule-of-thumb when it comes to choosing an appropriate number of processors. You will need to consider the decomposition of the processes in relation to the size of t...
by kwerner
Fri Jan 15, 2021 5:45 pm
Forum: Special Running Options
Topic: Bug in the wrfxtrm files?
Replies: 1
Views: 4

Re: Bug in the wrfxtrm files?

Hi,
I have moved this topic from the "Dynamics and Numerics" section of the forum to this "Special Running Options" section. Someone will respond to your inquiry soon.
by kwerner
Fri Jan 15, 2021 5:41 pm
Forum: geogrid
Topic: what is the land/water threshold in a grid cell to define it as land or water?
Replies: 3
Views: 32

Re: what is the land/water threshold in a grid cell to define it as land or water?

Hi, It should be perfectly fine to modify LANDUSE in the geo_em.* files or the wrfinput* files. We actually have an NCL program that allows you to modify landuse types in the geo_em* files. I know you have your program already, but if you are interested in that, take a look at this presentation (aro...
by kwerner
Fri Jan 15, 2021 5:25 pm
Forum: ungrib
Topic: ERA5 Forecast Field Data
Replies: 5
Views: 68

Re: ERA5 Forecast Field Data

Hi,
Can you try to use the Vtable.ECMWF to ungrib this data and see if it makes any difference? Please keep me posted. Thanks!
by kwerner
Thu Jan 14, 2021 7:23 pm
Forum: geogrid
Topic: what is the land/water threshold in a grid cell to define it as land or water?
Replies: 3
Views: 32

Re: what is the land/water threshold in a grid cell to define it as land or water?

Hi Maryam,
Looking at the code (e.g., WPS/geogrid/src/process_tile_module.F - line ), it looks like for LANDMASK the percentage is 50% for the grid cell, and if it were to be exactly 50%, it would be declared a water point. See line ~568.
by kwerner
Wed Jan 13, 2021 10:50 pm
Forum: WRF Compiling/Installation
Topic: WRFV compilation issue on CentOS 8
Replies: 1
Views: 20

Re: WRFV compilation issue on CentOS 8

Hi,
Can you also attach your configure file, along with your compile log? Thanks!
by kwerner
Sat Jan 09, 2021 12:31 am
Forum: Miscellaneous WRF
Topic: Gust_Wind Implementation?
Replies: 4
Views: 46

Re: Gust_Wind Implementation?

Alan,
I would suggest trying to contact some of the entities or groups connected to the work mentioned in the links you shared. If they've done it before, hopefully someone there will have some knowledge or a contact for you. Good luck!
by kwerner
Fri Jan 08, 2021 5:15 pm
Forum: WRF Code Modification
Topic: How to add qndrop to the output variable?
Replies: 1
Views: 26

Re: How to add qndrop to the output variable?

Hi, If you'd like to output qndrop, you should only need to add it to the packaged info for the Morrison scheme in the Registry.EM_COMMON file. So look for this line: package morr_two_moment mp_physics==10 - moist:qv,qc,qr,qi,qs,qg;scalar:qni,qns,qnr,qng;state:rqrcuten,rqscuten,rqicuten and since it...
by kwerner
Thu Jan 07, 2021 8:09 pm
Forum: Miscellaneous WRF
Topic: Gust_Wind Implementation?
Replies: 4
Views: 46

Re: Gust_Wind Implementation?

Hi, If you want to output max wind, there are a couple of diagnostics options built-in. They are available in V3.7, but not in 3.3. The options are output_diagnostics (which you mentioned, but does not have to be used with CLWRF) and nwp_diagnostics. You can read more about these in Version 3.7 of t...
by kwerner
Thu Jan 07, 2021 6:41 pm
Forum: metgrid
Topic: How to process ERA5 invariant data? Issue with LANDSEA mask; and a metgrid error.
Replies: 4
Views: 58

Re: How to process ERA5 invariant data? Issue with LANDSEA mask; and a metgrid error.

Hi, I ran a test with the invariant data, along with ERA5 surface and pressure level data, and tried to create a domain that was close to yours. My LANDSEA mask looks exactly like yours, and I think that's just due to the resolution of what's given to us from ERA. I'm not having any trouble with the...
by kwerner
Thu Jan 07, 2021 5:27 pm
Forum: ARWpost
Topic: Cannot post-process using ARWPost
Replies: 1
Views: 15

Re: Cannot post-process using ARWPost

Nizam,
Can you explain how it failed? Was there an error? Can you attach a log file and your namelist for ARWpost? Please also let us know which version of ARWpost you are using. Thanks.
by kwerner
Thu Jan 07, 2021 5:14 pm
Forum: ungrib
Topic: ERA5 Forecast Field Data
Replies: 5
Views: 68

Re: ERA5 Forecast Field Data

Hi, Just to make sure you're downloading the correct data, take a look at this FAQ that discusses using ERA5 data. Are you able to use the g1print.exe or g2print.exe utility on the data to read it? If you're still having problems, can you attach one time stamp of your data files so that I can test i...
by kwerner
Wed Jan 06, 2021 8:38 pm
Forum: General
Topic: Prep_chem_source namelist dificulty
Replies: 1
Views: 19

Re: Prep_chem_source namelist dificulty

This post has been moved from the "Forum Feedback" section to the General WRF-Chem section. Someone will respond soon.
by kwerner
Mon Dec 28, 2020 6:38 pm
Forum: WRF Compiling/Installation
Topic: Why different compilers have different results for the same case?
Replies: 4
Views: 60

Re: Why different compilers have different results for the same case?

Hi,
As I'm not a computer science person, I can't tell you "why" this happens, except that they process differently. This is completely expected, though, and we are aware that results will never be identical when using different compilers or machines.
by kwerner
Mon Dec 28, 2020 6:35 pm
Forum: real.exe
Topic: Error in psfc
Replies: 3
Views: 312

Re: Error in psfc

You're absolutely right. Thank you for bringing this to our attention. I've corrected the link. If you refresh the page, it should be correct now.
by kwerner
Mon Dec 28, 2020 6:21 pm
Forum: metgrid
Topic: How to process ERA5 invariant data? Issue with LANDSEA mask; and a metgrid error.
Replies: 4
Views: 58

Re: How to process ERA5 invariant data? Issue with LANDSEA mask; and a metgrid error.

Hi Tristan, It looks like the invariant file should also include SOILHGT information. I'm attaching the invariant file we use so that you can try skipping the ungrib process for that particular file. Just change the attached file name to ERA5_INVARIANT (removing the .txt suffix that was necessary to...
by kwerner
Mon Dec 28, 2020 5:39 pm
Forum: metgrid
Topic: Problem to run WRF with ERA5 on model levels
Replies: 1
Views: 23

Re: Problem to run WRF with ERA5 on model levels

Hi,
1) What version of WPS are you running?
2) Can you attach the full metgrid.log so that I can take a look?
3) Will you also attach your METGRID.TBL file (found in WPS/metgrid/)?
Thanks!
by kwerner
Mon Dec 28, 2020 5:29 pm
Forum: wrf.exe
Topic: WRF crashes in RUC LSM with Goddard MP scheme
Replies: 8
Views: 429

Re: WRF crashes in RUC LSM with Goddard MP scheme

If you are getting this same error, we recommend putting in some debugging print statements. See the post from me on Aug 6, 2019. If you're not already doing so, I would also recommend trying the latest version of WRF (V4.2.1) to see if that helps.
by kwerner
Mon Dec 28, 2020 5:23 pm
Forum: ARWpost
Topic: Fortran runtime error: Write exceeds length of DIRECT access record
Replies: 3
Views: 40

Re: Fortran runtime error: Write exceeds length of DIRECT access record

Olga,
Is NCL installed on your supercomputer?
by kwerner
Sat Dec 19, 2020 12:00 am
Forum: ARWpost
Topic: Fortran runtime error: Write exceeds length of DIRECT access record
Replies: 3
Views: 40

Re: Fortran runtime error: Write exceeds length of DIRECT access record

Hi Olga, I am seeing the same problem as you with geo_em* files. I, personally, have never tried running ARWpost for any output except wrfout* history files. I do see, however, that the Users' Guide says it should be compatible with geo_em* files. It may take a bit of time to track this down, unfort...
by kwerner
Wed Dec 16, 2020 4:20 pm
Forum: WRF Compiling/Installation
Topic: (RESOLVED) Error Compiling WRF3.8 - no executable files - netcdf problems
Replies: 3
Views: 55

Re: Error Compiling WRF3.8 - no executable files

That's great news! Thank you for sending an update.
by kwerner
Tue Dec 15, 2020 4:44 pm
Forum: FAQ: Configuring/Compiling/Hardware
Topic: Building WRF with NetCDF-c and NetCDF-fortran Libraries
Replies: 0
Views: 20

Building WRF with NetCDF-c and NetCDF-fortran Libraries

If you have built NetCDF with separate installations of NetCDF-c and NetCDF-fortran, you will need to combine the components so that the WRF model will be able to find the libraries. To do this, you can create a NetCDF directory, which should contain subdirectories called "lib," "include," and "bin....
by kwerner
Tue Dec 15, 2020 12:41 am
Forum: geogrid
Topic: Spatial artifacts in HGT_M in high-resolution domains
Replies: 2
Views: 34

Re: Spatial artifacts in HGT_M in high-resolution domains

Hi, I have been unable to repeat the problem, using your namelist setup - even down to 500 m. It looks like some of the static data you are requesting (modis_15s_lake, maxsnowalb_modis, and albedo_modis) are set-up in newer GEOGRID.TBL files (e.g., from V4.2). Are you using a newer GEOGRID.TBL to ru...

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