# JEDI **URL:** https://forums.jcsda.org/c/jedi/5.md [Latest](https://forums.jcsda.org/latest.md) · [Categories](https://forums.jcsda.org/categories.md) --- ## [About the JEDI category](https://forums.jcsda.org/t/about-the-jedi-category/15)
**Author:** [@mmiesch](https://forums.jcsda.org/u/mmiesch)\ **Replies:** 0
The Joint Effort for Data assimilation Integration (JEDI) is a unified, next-generation data assimilation system for Earth system prediction. This forum is intended for JEDI user support: For JEDI users and developers t… --- ## [Dual-resolution 3DEnVar in regional MPAS-JEDI](https://forums.jcsda.org/t/dual-resolution-3denvar-in-regional-mpas-jedi/770)
**Author:** [@zach](https://forums.jcsda.org/u/zach)\ **Replies:** 2\ **Last updated:** [October 6, 2026, 9:41pm UTC](https://forums.jcsda.org/t/dual-resolution-3denvar-in-regional-mpas-jedi/770 "2026-10-06T21:41:05Z")
Hello, Is dual-resolution 3DEnVar (background and ensemble at different resolutions) supported for regional MPAS-JEDI? The tutorial example is global (120 km background, 240 km ensemble)： MPAS-JEDI Tutorial — Practice S… --- ## [Supply a horizontal correlation .nc file to BUMP?](https://forums.jcsda.org/t/supply-a-horizontal-correlation-nc-file-to-bump/763)
**Author:** [@asafaie](https://forums.jcsda.org/u/asafaie)\ **Replies:** 2\ **Last updated:** [September 21, 2026, 5:53am UTC](https://forums.jcsda.org/t/supply-a-horizontal-correlation-nc-file-to-bump/763 "2026-09-21T05:53:12Z")
Hi, I’m trying to figure out how to configure my yaml files (for the Dirac unit test case, using dirac\_cov\_nicas.yaml and parameters\_bump\_cor\_nicas.yaml) so that instead of setting a constant value for the horizontal co… --- ## [FillValue questions when running SOCA observer offline](https://forums.jcsda.org/t/fillvalue-questions-when-running-soca-observer-offline/767)
**Author:** [@hhwei](https://forums.jcsda.org/u/hhwei)\ **Replies:** 0\ **Last updated:** [September 11, 2026, 3:10pm UTC](https://forums.jcsda.org/t/fillvalue-questions-when-running-soca-observer-offline/767 "2026-09-11T15:10:15Z")
Hi, I am trying to run the SOCA observer offline. I am currently using the model history file as the input model file instead of the restart file from GEFSv13. Is there anything I should be aware of when using the hist… --- ## [How can I obtain 3DVar static B files for a regional MPAS-JEDI？](https://forums.jcsda.org/t/how-can-i-obtain-3dvar-static-b-files-for-a-regional-mpas-jedi/677)
**Author:** [@CGC](https://forums.jcsda.org/u/CGC)\ **Replies:** 22\ **Last updated:** [August 21, 2026, 6:48pm UTC](https://forums.jcsda.org/t/how-can-i-obtain-3dvar-static-b-files-for-a-regional-mpas-jedi/677 "2026-08-21T18:48:51Z")
I am currently using MPAS-JEDI to perform 3DVar data assimilation for a regional forecast, but I am unable to find suitable static BE (background error covariance) files for my domain（15km， 1000km radius domain）. The tut… --- ## [JEDI and MPAS](https://forums.jcsda.org/t/jedi-and-mpas/764)
**Author:** [@JiaWANG](https://forums.jcsda.org/u/JiaWANG)\ **Replies:** 1\ **Last updated:** [August 21, 2026, 6:31pm UTC](https://forums.jcsda.org/t/jedi-and-mpas/764 "2026-08-21T18:31:24Z")
Can I ask why a JEDI version should only be interfaced a specific MPAS version? --- ## [MPAS-JEDI Envirnment setup on ASPIRE 2A](https://forums.jcsda.org/t/mpas-jedi-envirnment-setup-on-aspire-2a/766)
**Author:** [@SkyCanvas297](https://forums.jcsda.org/u/SkyCanvas297)\ **Replies:** 0\ **Last updated:** [August 14, 2026, 5:14am UTC](https://forums.jcsda.org/t/mpas-jedi-envirnment-setup-on-aspire-2a/766 "2026-08-14T05:14:19Z")
Hi Team, I have been trying to set up an environment for mos3r3n/mpas-bundle. However, when I run source code/env-setup/gnu-aspire2a.sh It shows that a few modules were unable to load. Can anyone working on ASPIRE … --- ## [Mismatch for arguments MPI\_BCAST](https://forums.jcsda.org/t/mismatch-for-arguments-mpi-bcast/745)
**Author:** [@antoniosandroni](https://forums.jcsda.org/u/antoniosandroni)\ **Replies:** 2\ **Last updated:** [June 9, 2026, 11:05am UTC](https://forums.jcsda.org/t/mismatch-for-arguments-mpi-bcast/745 "2026-06-09T11:05:18Z")
Hi, I am using the mpi module to manage the call of the subroutines of my new observation operator in the differents ranks. I am trying to avoid a multiple reading of a file from all the ranks(I checked that the run cra… --- ## [MPAS-JEDI Radar Reflectivity Algorithm Error](https://forums.jcsda.org/t/mpas-jedi-radar-reflectivity-algorithm-error/740)
**Author:** [@amercer](https://forums.jcsda.org/u/amercer)\ **Replies:** 1\ **Last updated:** [April 30, 2026, 10:13pm UTC](https://forums.jcsda.org/t/mpas-jedi-radar-reflectivity-algorithm-error/740 "2026-04-30T22:13:11Z")
I am trying to utilize MPAS-JEDI’s 3dVAR application to assimilate Nexrad Level II radar reflectivity. I wrote a script to convert Level II data to IODA format, which seemed to assimilate when I did it with velocity, bu… --- ## [MPAS-JEDI build error during make on Ubuntu (undefined reference to \_gfortran\_transfer\_real\_write)](https://forums.jcsda.org/t/mpas-jedi-build-error-during-make-on-ubuntu-undefined-reference-to-gfortran-transfer-real-write/729)
**Author:** [@Astrogirlanajli](https://forums.jcsda.org/u/Astrogirlanajli)\ **Replies:** 2\ **Last updated:** [March 17, 2026, 4:21am UTC](https://forums.jcsda.org/t/mpas-jedi-build-error-during-make-on-ubuntu-undefined-reference-to-gfortran-transfer-real-write/729 "2026-03-17T04:21:07Z")
Hello everyone, I am trying to build MPAS-JEDI using the spack-stack environment on Ubuntu. The configuration step completes successfully, but the build fails during the linking stage. Environment Host OS: Windows wi… --- ## [Meaning of hofx0, hofx1, hofx2 after MPAS-JEDI bias correction](https://forums.jcsda.org/t/meaning-of-hofx0-hofx1-hofx2-after-mpas-jedi-bias-correction/735)
**Author:** [@LL\_GZ](https://forums.jcsda.org/u/LL_GZ)\ **Replies:** 0\ **Last updated:** [March 12, 2026, 7:52am UTC](https://forums.jcsda.org/t/meaning-of-hofx0-hofx1-hofx2-after-mpas-jedi-bias-correction/735 "2026-03-12T07:52:55Z")
After I ran the satellite bias correction, the output file obsout\_3denvar\_bc\_amsua\_n19.nc4contains hofx0, hofx1, hofx2in hofx, and EffectiveQC0, EffectiveQC1, EffectiveQC2in EffectiveQC. I would like to confirm my und… --- ## [Mpas-jedi B sample data's date](https://forums.jcsda.org/t/mpas-jedi-b-sample-datas-date/724)
**Author:** [@rqin\_624](https://forums.jcsda.org/u/rqin_624)\ **Replies:** 1\ **Last updated:** [March 6, 2026, 5:35pm UTC](https://forums.jcsda.org/t/mpas-jedi-b-sample-datas-date/724 "2026-03-06T17:35:04Z")
Hi, I have a question about the mpas-jedi B sample data’s date. in 3\_convert\_uv\_to\_psichi.bash: the commented “# f\_fcst=…” line, is a more common dir structure “init\_dir/output.valid\_date.nc“. but the actually used … --- ## [Staggered-grid variables in a JEDI model interface](https://forums.jcsda.org/t/staggered-grid-variables-in-a-jedi-model-interface/722)
**Author:** [@zsimin97](https://forums.jcsda.org/u/zsimin97)\ **Replies:** 0\ **Last updated:** [February 24, 2026, 2:23pm UTC](https://forums.jcsda.org/t/staggered-grid-variables-in-a-jedi-model-interface/722 "2026-02-24T14:23:57Z")
I would like to ask for guidance on how staggered grids should be represented within a JEDI model interface. In our model, some variables are defined on a staggered grid (e.g., different horizontal locations for U/V win… --- ## [Difference between mpas-bundle and spack-stack](https://forums.jcsda.org/t/difference-between-mpas-bundle-and-spack-stack/632)
**Author:** [@bigveech](https://forums.jcsda.org/u/bigveech)\ **Replies:** 2\ **Last updated:** [February 24, 2026, 9:09am UTC](https://forums.jcsda.org/t/difference-between-mpas-bundle-and-spack-stack/632 "2026-02-24T09:09:44Z")
Hello everyone, I’m attempting to do some data assimilation with using JEDI MPAS. I started by looking at this repo GitHub mpas-jedi which suggested that I use mpas-bundle. After attempting to build, I came across anot… --- ## [UFO Variables, need for levels quantities](https://forums.jcsda.org/t/ufo-variables-need-for-levels-quantities/721)
**Author:** [@antoniosandroni](https://forums.jcsda.org/u/antoniosandroni)\ **Replies:** 0\ **Last updated:** [February 20, 2026, 8:38pm UTC](https://forums.jcsda.org/t/ufo-variables-need-for-levels-quantities/721 "2026-02-20T20:38:31Z")
Hi, I am currently trying to integrate an observation operator in JEDI and I am working on the UFO interface. I am wondering if trough the ufo variables defined in ufo\_variables\_mod.F90 I can obtain the values of some v… --- ## [Sample Marine data for SOCA 3dvar](https://forums.jcsda.org/t/sample-marine-data-for-soca-3dvar/720)
**Author:** [@abhisek](https://forums.jcsda.org/u/abhisek)\ **Replies:** 0\ **Last updated:** [February 13, 2026, 5:23pm UTC](https://forums.jcsda.org/t/sample-marine-data-for-soca-3dvar/720 "2026-02-13T17:23:37Z")
Hi all, I am new to JEDI. Would like to implement JEDI-SOCA for OM4 MOM6 configuration. I could install the Jedi-bundle using a container image and run the one 3dvar assimilation cycle on OM4 with the help of GitHub - t… --- ## [MPAS-JEDI for satellite bias correction](https://forums.jcsda.org/t/mpas-jedi-for-satellite-bias-correction/719)
**Author:** [@LL\_GZ](https://forums.jcsda.org/u/LL_GZ)\ **Replies:** 0\ **Last updated:** [February 13, 2026, 2:35am UTC](https://forums.jcsda.org/t/mpas-jedi-for-satellite-bias-correction/719 "2026-02-13T02:35:13Z")
1. Question about using MPAS-JEDI for satellite bias correction: I would like to use MPAS-JEDI for satellite bias correction, but it seems that this part is not covered in the available tutorials. Could you please provi… --- ## [JEDI MPI Issue on Derecho](https://forums.jcsda.org/t/jedi-mpi-issue-on-derecho/716)
**Author:** [@RobinArmstrong](https://forums.jcsda.org/u/RobinArmstrong)\ **Replies:** 6\ **Last updated:** [January 8, 2026, 5:36pm UTC](https://forums.jcsda.org/t/jedi-mpi-issue-on-derecho/716 "2026-01-08T17:36:52Z")
Hello, When I try to run mpasjedi\_variational.x on Derecho, I’m getting a puzzling MPI error. It always occurs just after the ==\> create geom messages start to be displayed. Here is the error. MPICH ERROR \[Rank 16\] \[jo… --- ## [MPAS-JEDI ctest failure (test\_mpasjedi\_geometry)](https://forums.jcsda.org/t/mpas-jedi-ctest-failure-test-mpasjedi-geometry/715)
**Author:** [@AKnight](https://forums.jcsda.org/u/AKnight)\ **Replies:** 1\ **Last updated:** [December 15, 2025, 9:31pm UTC](https://forums.jcsda.org/t/mpas-jedi-ctest-failure-test-mpasjedi-geometry/715 "2025-12-15T21:31:31Z")
I have made it through the entire build process, but when I go to run the ctest from the build/mpas-jedi, the three geometry tests (2:test\_mpasjedi\_geometry, 8:test\_mpasjedi\_geometry\_iterator\_2d\_2pe, 9:test\_mpasjedi\_geom… --- ## [Not found "librtm.so" to compile oops on Derecho](https://forums.jcsda.org/t/not-found-librtm-so-to-compile-oops-on-derecho/714)
**Author:** [@antoniosandroni](https://forums.jcsda.org/u/antoniosandroni)\ **Replies:** 9\ **Last updated:** [December 9, 2025, 3:28pm UTC](https://forums.jcsda.org/t/not-found-librtm-so-to-compile-oops-on-derecho/714 "2025-12-09T15:28:42Z")
Hi, I am currently compiling the MPAS-JEDI bundle on Derecho and I just did many times in the past but now that I got my account and resources back after a little period of having my account deactivated I am finding a pr… --- ## [Build fv3-jedi outside of jedi-bundle](https://forums.jcsda.org/t/build-fv3-jedi-outside-of-jedi-bundle/712)
**Author:** [@rickgrubin-noaa](https://forums.jcsda.org/u/rickgrubin-noaa)\ **Replies:** 5\ **Last updated:** [December 5, 2025, 6:21pm UTC](https://forums.jcsda.org/t/build-fv3-jedi-outside-of-jedi-bundle/712 "2025-12-05T18:21:37Z")
Building fv3-jedi outside of jedi-bundle -- --------------------------------------------------------- -- Build summary -- --------------------------------------------------------- -- system : \[host\] \[Linux-5.15.0-108… --- ## [Ctest errors when compiling JEDI in a single precision mode](https://forums.jcsda.org/t/ctest-errors-when-compiling-jedi-in-a-single-precision-mode/708)
**Author:** [@JiaWANG](https://forums.jcsda.org/u/JiaWANG)\ **Replies:** 3\ **Last updated:** [November 11, 2025, 5:45pm UTC](https://forums.jcsda.org/t/ctest-errors-when-compiling-jedi-in-a-single-precision-mode/708 "2025-11-11T17:45:19Z")
On Derecho, when I compile JEDI in the default double precision mode, all tests are passed. But when I compile JEDI in a single precision model, tests are failed starting from the 3rd test “test\_mpasjedi\_state“. These … --- ## [Variables in the ensemble samples](https://forums.jcsda.org/t/variables-in-the-ensemble-samples/710)
**Author:** [@LL\_GZ](https://forums.jcsda.org/u/LL_GZ)\ **Replies:** 1\ **Last updated:** [November 11, 2025, 5:40pm UTC](https://forums.jcsda.org/t/variables-in-the-ensemble-samples/710 "2025-11-11T17:40:58Z")
When using MPAS-JEDI for ensemble variational data assimilation, what variables need to be included in the generated sample files? --- ## [IODA not finding netcdf-cxx](https://forums.jcsda.org/t/ioda-not-finding-netcdf-cxx/709)
**Author:** [@mmiesch1](https://forums.jcsda.org/u/mmiesch1)\ **Replies:** 6\ **Last updated:** [September 30, 2025, 10:51pm UTC](https://forums.jcsda.org/t/ioda-not-finding-netcdf-cxx/709 "2025-09-30T22:51:39Z")
Hi all - so I’m having a problem building ioda on my linux laptop. Cmake can’t find netcdf-cxx. I have my own spack installation, based partly on the spack-stack version of spack. When I link to netcdf for oops and s… --- ## [The precision of JEDI](https://forums.jcsda.org/t/the-precision-of-jedi/706)
**Author:** [@JiaWANG](https://forums.jcsda.org/u/JiaWANG)\ **Replies:** 6\ **Last updated:** [September 30, 2025, 3:26pm UTC](https://forums.jcsda.org/t/the-precision-of-jedi/706 "2025-09-30T15:26:53Z")
In the JEDI tutorial, it stated that “Note that the tutorial test cases are designed with single-precision MPAS model test dataset. Therefore, we pre-compiled mpas-bundle code with single-precision mode“. How to compile… --- ## [Modules to build JEDI on Orion/Hercules with FMS/2023.04](https://forums.jcsda.org/t/modules-to-build-jedi-on-orion-hercules-with-fms-2023-04/599)
**Author:** [@hbo9955](https://forums.jcsda.org/u/hbo9955)\ **Replies:** 17\ **Last updated:** [September 18, 2025, 9:50pm UTC](https://forums.jcsda.org/t/modules-to-build-jedi-on-orion-hercules-with-fms-2023-04/599 "2025-09-18T21:50:01Z")
Hello, Due to the recent update of FMS to 2024.03, I failed to build the recent JEDI using the spack-stack 1.7.0 modules on Hercules and Orion (3. Pre-configured sites — spack-stack 1.7.0 documentation). I also tried “m… --- ## [Lognormal DA](https://forums.jcsda.org/t/lognormal-da/694)
**Author:** [@sjfletcher](https://forums.jcsda.org/u/sjfletcher)\ **Replies:** 0\ **Last updated:** [August 13, 2025, 4:39pm UTC](https://forums.jcsda.org/t/lognormal-da/694 "2025-08-13T16:39:12Z")
Hi there I am on a project that wishes to introduce the lognormal approach for the moisture variables but I am having troubnle understanding where to introduce these changes. Specifically the following 4 tings, I have … --- ## [SOCA diag files](https://forums.jcsda.org/t/soca-diag-files/688)
**Author:** [@jsouza\_psl](https://forums.jcsda.org/u/jsouza_psl)\ **Replies:** 2\ **Last updated:** [June 6, 2025, 10:32pm UTC](https://forums.jcsda.org/t/soca-diag-files/688 "2025-06-06T22:32:03Z")
Hi, I am running a coupled 3DVar case. Could someone, please, provide a description of the variables contained in the diag output files generated for each sensor assimilated? I am specially interested in the difference… --- ## [Trouble running mpasjedi\_hofx3d.x with mpas-bundle 3.0.2](https://forums.jcsda.org/t/trouble-running-mpasjedi-hofx3d-x-with-mpas-bundle-3-0-2/679)
**Author:** [@steve.marshall](https://forums.jcsda.org/u/steve.marshall)\ **Replies:** 15\ **Last updated:** [May 29, 2025, 10:24pm UTC](https://forums.jcsda.org/t/trouble-running-mpasjedi-hofx3d-x-with-mpas-bundle-3-0-2/679 "2025-05-29T22:24:15Z")
I’m having trouble getting past the initialization phases when running mpasjedi\_hofx3d.x using mpas-bundle 3.0.2. First, I created input data by converting a 27-hour sequence of of 3-hourly GFS GRIB data on pressure coo… --- ## [Initial Perturbation for Regional MPAS](https://forums.jcsda.org/t/initial-perturbation-for-regional-mpas/670)
**Author:** [@YaShinChi](https://forums.jcsda.org/u/YaShinChi)\ **Replies:** 1\ **Last updated:** [May 5, 2025, 2:06pm UTC](https://forums.jcsda.org/t/initial-perturbation-for-regional-mpas/670 "2025-05-05T14:06:05Z")
Hi, We are planning to conduct ensemble forecasts on the regional MPAS using only initial perturbations, without data assimilation. Is there any recommended system or framework for this purpose? Thanks. [Next page](https://forums.jcsda.org/c/jedi/5.md?page=1)