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You certainly can - I have WRF4.5 compiled on my M2 Max. I found the flags needed to be slightly different as there were issues getting both NetCDF libraries to compile properly. Here's what I used for my environment, then you can follow the main compilation tutorial normally: A couple of...

Hi all, I recently computed a four domain (25km, 5km, 1km, 200m) simulation and received realistic output. However, after looking through the guidelines I came across the following: "PBL schemes can be used for most grid sizes when surface fluxes are present; however, at grid size dx << 1 km...

The ECMWF guidelines for GRIB numbers are also found here: Copernicus European Regional ReAnalysis (CERRA): product user guide - Copernicus Knowledge Base - ECMWF Confluence Wiki

Hi Kwerner, The data is indeed in GRIB2 format. I've attached the output of g2print.exe for the three files (pl, sfc, and soil). There are a few... issues. One of them being that the CERRA dataset stores 10m wind as wind speed and wind direction, rather than U and V components. I decomposed...

Unfortunately, ECMWF weren't much help, so I thought I'd try and tackle it myself... Do you have any knowledge on deciphering differences between g1print.exe and g2print.exe differences? g1print clearly extracts the GRIB code numbers, yet g2print does not... I'm wondering if this is a...

With the release of CERRA, a 5.5km horizontal resolution reanalysis dataset with Europe coverage, comes the potential for high resolution WRF simulations without the need for a super-coarse parent domain: Copernicus regional reanalysis for Europe (CERRA) | Copernicus Has anyone constructed a...

Digging into this a little more, I looked into near-surface variables outputted in wrfout files compared to interpolated near-surface variables using WRF-Python. Attached is an example, where the interpolated u10 clearly shows the town of Lubbock, but it looks smoothed and more realistic. The...

Hi all, I noticed some strange speckled effects in my wrfout files and managed to traces them back to the landuse in the geo_em files. Using the same GEOG inputs, I found significant differences in how the landuse is calculated between WPS v4.1 and WPS v4.4, which is having a detrimental effect...

I think I've found the culprit. Analysing the LU_INDEX in the simulation's geo_em.d03 file returns a familiar looking pattern. So, for some reason, the simulation is doing something odd with the landuse. Any ideas?

Hi Ming, Thanks for the advice, I re-ran the simulation using sf_surface_physics = 2, 2, 2, sf_urban_physics = 2, 2, 2, Unfortunately, I'm still seeing an obvious Lubbock and the speckled effects. I also tried a fixed colour scale to see if the effects...

Hi all, I'm currently running a nested (25km > 5km > 1km) configuration centred over Lubbock, Texas, yet I'm finding some intriguing artefacts in my output fields. The plots attached show a handful of variables of interest where some clear features are present: 1. The town of Lubbock itself...

Hi all, I’m noticing some unusual behaviour in my high-resolution (1 km horizontal) WRF simulations. First, lakes (or inland water bodies) are always noticeable in the surface fields (e.g., 2m temperature, 10m wind components), as shown in the attached figures (Figs. 1-3). I have tried several...

Hi Kwerner, Indeed, I've run a few extra tests with diff_6th_opt=2 and a handful of different dynamics settings with no luck. The waves resolve before the end of the simulations, and in some cases are highly unrealistic. Some days the flow field begins to evolve in a realistic manner before...

Hi all, I'm running a WRF v4.1.3 configuration using ndown and finding some unusual wave-like patterns in the radiation fields. The current configuration is set up to produce domains at 25, 5, and 1 km horizontal resolution. The wave-like patterns are shown in the attached .png file for the 1...

Thanks for the help! As for extracting the coefficients, would I need to edit the Registry.EM file and recompile the model, or is there a way to edit my current compilation?

Hi Ming, (1) Horizontal resolution of 200 m and 60 vertical levels. (2) Physics schemes: mp_physics = 8 (Thompson scheme) sf_sfclay_physics = 2 (Eta similarity scheme) sf_surface_physics = 1 (5-layer thermal diffusion scheme) bl_pbl_physics = 2 (MYJ scheme) (3) Air parcel trajectories to...

Hi there, I'm looking to output friction in my wrfout files, could anyone guide me as to how? I can obtain U*; hence, can work some magic to calculate surface friction, but I'm looking for a 3D friction field. Thanks.