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    Some questions about SMOIS and CANWAT

    Hi Ming, OK. Great! Thank you for your quick response. -David
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    Some questions about SMOIS and CANWAT

    Hi WRF support, I am running a real-case simulation using the Noah Land Surface Scheme. I have some questions about the inconsistencies between my met_em, wrfinput, and wrfout files regarding a few land-state variables. The first one is CANWAT (canopy water). I was looking into my CANWAT...
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    Stripes in U and V fields

    Hi Dr. Werner, That's OK. We ran the same simulation with different diff_6th_opt_factors ranging from 0.005 to 0.12. Using diff_6th_opt = 2 sufficiently reduces the stripes with any use of diff_6th_opt_factor above 0.005, but for reasons that we still do not understand very well, it also...
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    Stripes in U and V fields

    Hi Dr. Werner, Sorry, I just want to make sure that I understood your response correctly. When you say the stripes are 'resolved' by the end of my simulation do you mean that they disappear? Most of the stripes are gone (or fizzle out) about 3-4 hours before the end of my simulation. In...
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    Stripes in U and V fields

    Hi Dr. Werner, Yes, turning on diff_6th_opt=2 did remove the stripes in both staggered U and V. However, I was wondering if the stripes are a normal model behavior and I didn't do anything wrong in my simulation setup. In other words, the model wasn't producing wrong results per se if I don't...
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    Stripes in U and V fields

    Hi WRF support, Recently, I noted there are some unphysical stripes (where the velocity of a particular component is some magnitude at one point while it is the magnitude but the opposite direction at the neighboring grid point) in my 3D U and V fields when viewing a wrfout file using NCVIEW...
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    QNSE PBL/SFCLAY simulated surface fields

    Hi WRF support, If possible, can I get a follow-up on this issue? Thanks, David
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    WRF 2D variables in NCVIEW

    OK. I was using the nearest-neighbor interpolation scheme for these two fields, which is the default. It gave me the blocky-looking pattern in the soil types fields. I tried using the four_pt interpolation scheme for these categorical fields, but nothing seemed to change for the dominant soil...
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    Low resolution of Soil moisture(SMOIS) in wrf_out file

    Hi all, I am seeing a similar blocky pattern in some of my WRF 2D fields (e.g., T2, TH2, Q2, HFX, etc). My 10-m wind variables look fine though since they are unrelated to soil type. Ming had pointed out that this is due to the dominant soil category (ISLTYP) having a coarse resolution, so I...
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    WRF 2D variables in NCVIEW

    Hi Ming, I just checked these two fields in my output files. ISLTYP demonstrates a similar box pattern but IVGTYP shows a rather smooth pattern. Is this because ISLTYP is related to SOILCTOP and SOILCBOT variables in GEOGRID.TBL? Would changing the interp_options for these two variables in...
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    WRF fails with ExitCode 66

    Hi Ming, Yes. I agree. That is what I thought too. I can try your suggestion. I will let you know once I have done that. In the end, I would still like to keep using the higher resolution geographic dataset though. Thank you and bests, David
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    WRF 2D variables in NCVIEW

    I have attached the namelist.input I used for this simulation. I am using QNSE PBL and surface layer schemes and Noah LSM. For now, I am not terribly concerned about this problem since it doesn't seem to have a significant adverse effect on my simulation results. Please let me know if this is...
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    WRF fails with ExitCode 66

    Hi WRF support, Just some update. I found a workaround to this problem by setting 'input_from_field' in my namelist.input to false for the fourth domain. Thus, the initial static and meteorological fields for the fourth domain are interpolated down from the third domain (I believe). Now, the...
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    WRF 2D variables in NCVIEW

    Hi WRF support, I am curious why am I seeing some strange-looking boxes in some of the 2D fields (e.g., 2-m air temperature, 2-m potential temperature, 2-m water vapor mixing ratio, and heat fluxes) when viewing them using NCVIEW? I have attached the screenshot of T2 and TH2 plotted using...
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    WRF fails with ExitCode 66

    Hi WRF Support, I am running a real-case WRF simulation (WRF v4.2.1) with four nested domains. My simulation initialized correctly with four wrfinput files, one for each domain, produced. However, when I executed wrf.exe, it failed pretty quickly while still writing the wrfout files at the...
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    Questions about time step

    Hi WRF Help, I have a few questions about the WRF model time step. I am running a two-way nested real-case simulation with three domains. The coarsest domain has a spatial resolution of 9 km. I set my parent_grid_ratio to = 1, 3, 3, so my two nested domains have horizontal resolutions of 3...
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    hail_opt problem in WRF-ARW 3.9.1.1

    Hi Ming, OK. Thanks for your additional comments about this. Now things are a lot clearer. I do have another question about the WDM6 scheme in WRF v4.2.1. In WRF github's page, there is a bug report regarding the microphysics scheme (https://github.com/wrf-model/WRF/issues/1316). The issue...
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    linking WRF input files

    Hi Ming, Thanks for your answer! For now, I set my interval_seconds to 21600 (six hours), so I believe my simulation is driven only by the 6-hourly analysis files. If I set interval_seconds to 10800 (3 hours) instead, then the NAM forecast files would be used to create the met_em files?
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    A question about parent_id in namelist.input

    OK. Great! Was kind of assuming that but it's great to have a confirmation. Thanks!
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    A question about parent_id in namelist.input

    Hi WRF help, I have a question about the 'parent_id' field in namelist.input file. I am running a two-way nested real-case simulation with three domains. In my namelist.input file, I have the parent_id of my coarsest domain set to 0 (as in many real-case examples). However, in some...
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