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wps

  1. H

    WRF Overestimates Wind - Tried Nudging Observations?

    Hi everyone, I'm currently working with WRF and have successfully run some simulations. However, the model tends to overestimate higher wind speeds while underestimating calm or lower wind conditions. I'm interested in nudging observed wind data into the WRF to improve its performance...
  2. F

    WPS error when run With ERA-5

    Hello everyone, I’m currently trying to run WRF-ARW v4.6.0 using ERA5 reanalysis data, and I’ve run into a persistent issue that I’d appreciate any insights on. As you know, ERA5 provides surface and upper-air (pressure level) data separately, while WRF requires both vertical and surface data...
  3. P

    LANDUSE and using non-default land category datasets

    Hello, this is a bit of a non-standard question. I am looking into upgrading my knowledge of using WRF. My simulation needs are often in complex and coastal terrain, so I would like to use higher-resolution input data (specifically, static data). I've already adopted higher-resolution...
  4. P

    Trouble with ungribbing ERA5 data - Mismatch between namelist and input file dimensions

    Hello, After a year-long hiatus, I have started running WRF simulations again. Last time I used WRF, I downloaded data from the Copernicus CDS, and ungribbed it using the Vtable.ECMWF. I used the cdsapi python script to download the data. All worked fine. The WRF version was 4.3.3, and I...
  5. G

    Use of sf_lake_physics

    I am trying to run a WRF simulazione over the Alpine region, which works correctly unless I try to activate sf_lake_physics. In that case, it stops after a few seconds, with the last line in the output file being: the total number of lake grid is : 0 (the result is the same with Noah...
  6. L

    geog_data_res = 'modis_30s+noah', static input data.

    Hello guys, I am trying to make a simulation for my studies. I was told that " geog_data_res = 'modis_30s+noah'" is recommended for my simulation. I have a coarser domain of 15km and a finer domain of 5km. But I got this error: "Parsed 50 entries in GEOGRID.TBLProcessing domain 1 of 2ERROR...
  7. T

    WRF Urban Fraction (FRC_URB2D) Not Processing in geogrid.exe

    Hi All, I'm trying to use Gao's 2020 SSP5 urban fraction data (https://dataverse.harvard.edu/file.xhtml?persistentId=doi:10.7910/DVN/85PJ1D/N3Y1JC&version=1.0) in WRF. I followed the User Guide to convert TIFF to BIL format and make WRF-ready files (Chapter 3: WRF Standard Initialization), but...
  8. B

    intermediate files does not include the fields on the 0.01 hPa isobaric levels from GFS grib2 data.

    Hi WRF/WPS users and wrfhelp, I'd like to get some guidance to "ungrib" the GFS's higher level isobaric fields. In my understanding, GFS grib2 format file includes the higher level isobaric fields up to 0.01 hPa since March 22, 2021. In my testing, however, the intermediate file generated from...
  9. K

    ERROR: Error in ext_pkg_write_field when running metgrid

    I am trying to run WRF with ERA5 Dateset (ERA5 hourly data on pressure levels from 1940 to present and ERA5 hourly data on single levels from 1940 to present) but I encountered an error on metgrid (refer to the metgrid.log file). How to proceed?
  10. G

    Ungrib fails for data from a specific year

    The message I get in the ungrib log is: End-of-record mark (7777) not found 0 Sec0(1) = 283230 0 *** stopping in findgrib in gribcode ***\n \tI could not find the GRIB string in the input file \tafter testing the first 100,000 bytes. \tThe file may be corrupt or it is not a GRIB file...
  11. L

    ungrid.exe doesn't recognizing forecast time in mimutes (grib2)

    I am trying to process GRIB2 files that contain forecast_time in minutes, but ungrib does not seem to recognize the time in minutes and is failing during the processing. When I use the ncl_filedump tool to inspect the GRIB2 file, it correctly identifies the forecast_time as 40 minutes. However...
  12. K

    double free or corruption problem in geogrid.exe process

    I had the following problem with geogrid.exe in WPS. The namelist and geogrid.log as the uploaded file. I didn't modify the options in namelist to check if geogrid.exe file is created or not, I used the original one in the installation. I would be grateful if you can help me.
  13. A

    How to combine lake temperatures and SST from GCM data into WPS?

    Hello, I'm currently in the process of setting up a WRF simulation that uses the ARISE-SAI-1.5 GCM (variant of CESM2) as initial boundary conditions. My current domain encompasses CONUS, of which I will be doing climate simulations for various ensemble members. Upon initial setup, I included...
  14. A

    Ungrib error at last timestep: "Data not found: 2022-02-28_00:00:00.0000"

    Hello, I'm encountering an issue with my WRF simulations that I haven't been able to resolve. I'm running a series of 15-day simulations (with an additional 2-day spin-up), starting on January 1st, 2022, then January 15th, and so on, with the goal of covering the entire year. Everything worked...
  15. A

    era5_to_int generating different num_metgrid_levels value

    Hi all. I have just used era5_to_int to generate my intermediate WRF files for the first time. I noticed the my met files now have num_metgrid_levels = 138, instead of the usual 38 value. I was wondering if someone can help me figure out how to get num_metgrid_levels = 38 again. Also, is a...
  16. F

    Missing values encountered in interpolated fields when running metgrid with UCAR ERA5 Data

    Dear all, I'm (desperately) try to run WRF with the ERA5 data available from UCAR through the era5_to_int Python script. Through extensive research and trial and error I think I've understood the variables needed to run WRF with the --isobaric option of era5_to_int which are the following: -...
  17. M

    geogrid and metgrid displaying error messages when run in parallel

    I have an appplication that is very performance-critical and therefore I would like to run especially metgrid with MPI. However, I get messages of the form ERROR: Error in ext_pkg_open_for_write_begin. I am using WPS 4.6.0 and I run it with mpirun -np 4 ./geogrid.exe. I compiled with the MPI...
  18. R

    real.exe error in WRF-Chem (psfc computation issue) - Single domain MOZART attempt

    Dear WRF-Chem community and all, I'm encountering an error when running real.exe in the WPS of WRF-Chem on a Red Hat 64-bit Linux virtual machine. This is my first attempt at running real.exe(chem_opt=0), and it fails to generate wrfbdy_d01 and wrfinput_d01 files. The error message in...
  19. B

    How to Make SST Data Match the Coastline in WRF Simulation?

    Hello everyone, I encountered some issues after adding SST data into my WRF simulation. The SST data I used is from the ERA5 reanalysis dataset with a resolution of 27 km. I am using WRF version 4.3.2. The two images below show the visualization of SST and LANDMASK from the wrfout file. As you...
  20. Q

    Replacement of LAI and GVF

    In the WPS, I replaced the LAI12 and GREENFRAC values using the MODIS product in the geo_em_d0* in the following pictures. But, I got the bad vegetation fraction values from the wrfinput_d02 and wrflowinp_d02 after real.exe in following pictures . The FVEG equal 0 in the d02 domain...
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