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Questions tagged [wrf]

The Weather Research & Forecasting Model

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0answers
21 views

How to control output precision when running WRF?

I am very new in this area and wondering if anyone can answer my following questions: I am running WRF (4.0.3, ideal) to study rounding and truncation. I use the NCL (6.5.0) print command to access ...
2
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1answer
387 views

run the WRF model using ERA5

I want to run wrf chem with ERA 5. I followed this post https://dreambooker.site/2018/04/20/Initializing-the-WRF-model-with-ERA5/. Everything works fine unless I add surface pressure to surface data ...
2
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1answer
628 views

WRF vertical integrated moisture flux using NCL

Does anyone know how to calculate the vertical integrated moisture flux using NCL in WRF. It would be best if you can share a NCL script. Here is my code, I used this code to calculate the averaged ...
1
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0answers
65 views

WRF: minimal list of variables required by coupling a land surface model to the whole system

We are trying to couple our land surface model into WRF. As a first step, we'd like to know what is the minimal list of variables required by such coupling?
1
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1answer
271 views

WRF: EPSG code or spatial reference for Lambert conformal, Mercator and polar stereographic projections [closed]

I'm building an R package (https://github.com/ibarraespinosa/wrftools) to read namelist.wps and return a dynamic map which you can make zoom. In my case, it would be very beneficial because writing a ...
1
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0answers
309 views

WRF I/O: Can any variable be output into the wrfout file-stream?

This question is related to the WRF (Weather Research and Forecasting) Model I read somewhere that a variable one wants to output, needs to be defined as state variable in the Registry like this (...
5
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2answers
220 views

How to map emission inventory from lat&lon corrdinate to WRF model grid

Here, I have a regional emission inventory, which mainly contains the varibales of lat,lon,...
2
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0answers
92 views

What is the general procedure to run WRF-chem with chen_opt=16

Is there anybody who has run WRF-chem with chem_opt=16 successfully to simulate the green house gases? According to the User guide, it can be done in this way. But ...
3
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1answer
849 views

How to install WRF on a Mac?

I would like to install the WRF model on my Mac computer. Where can I find up to date and step-by-step instructions on how to install it?
3
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1answer
469 views

How to properly setup a domain in NWP model (WRF) according to meteorological input data

I want to setup a mesoscale weather prediction model (WRF or something else) to work with NCEP/GFS meteorological input data with resolution of 0.25deg. My question is how to choose a proper size for ...
6
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1answer
78 views

Does thermal bubble initiated in WRF dissipate over time?

I am running idealised supercell simulation using WRF model. The supercell storm is initiated with a thermal bubble. I just wonder if the thermal bubble is only affecting the initial temperature. I ...
3
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3answers
1k views

ECMWF data as WRF input

I have earlier used FNL, CFSR, Reanalysis-2 data set as input in WRF. However, I am finding it difficult to download ECMWF data as there are so many variables. Can anyone with experience in ECMWF let ...
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0answers
346 views

SIGINT error WRF

I am trying to run WRF 3.8.1 using ncep2 but after a while the run stops and I get following error: ...
6
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1answer
575 views

Why is WRF-Chem not reading my emissions data?

I've been trying to run WRF-Chem with my emissions but they are not being read by WRF-Chem. RADM2. I have emissions for the whole week, so io_style_emissions = 2 ...
5
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1answer
2k views

Running WRF with ECMWF GRIB2 model levels

ECMWF model data comes in a hybrid GRIB format, that is, model level output is stored in GRIB2 messages, whereas surface data still uses GRIB1 format. Ungrib is unable to understand this hybrid GRIB ...
5
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0answers
94 views

Dig in the rationality of model evaluation of WRF with land-based station data

I use WRF (Weather research and forecasting) model for in regional scale meteorology simulation. And then, the WRF output files will be deemed as criterial input data applying for chemical transport ...
11
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3answers
287 views

Does finer input data lead to a better model accuracy?

Climate and chemical transport models all need input files including meteorology data, emission inventory, surface data (e.g. land use type) to initialize the simulation field. Take the case of WRF ...
3
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1answer
90 views

What denotes a parameterization in a model? (semantics )

I know that WRF has many different uses and options, from atmospheric chemistry to uses with fires, and so on. What exactly denotes a parameterization? For example, in WRF-Chem, is the chemistry ...
2
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1answer
997 views

How to set up a domain from namelist in WRF?

I'm fairly inexperienced with WRF and was wondering if anyone could point me in the direction of any helpful resources for it. The task I have is to make a simple 9 km domain, but I'm having trouble ...
4
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0answers
214 views

How to transform the inventory data from degrees to kilometers

First all, my question was different from the question Converting grid resolution from degrees to kilometers. In chemical transport modeling, the pollutant source inventory was an essential input ...
3
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0answers
158 views

How to output slope parameter and shape parameter in WRF?

I'd like to ask if it's possible to output slope parameter and shape parameter of cloud hydrometeors in WRF? I'm calculating cloud effective radius and I'm using the formula found in Morrison scheme ...
12
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1answer
2k views

Why is WRF most often configured at 3:1 nesting ratio?

In WRF application, nested domain has always been used for weather/air quality modeling for the place of interest in a better resolution. The figure below illustrates this: I have noticed that the ...
4
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2answers
193 views

Why does computation cost increase 24 times when the spatial resolution doubles?

In a Chinese book, I read about the relationship between the numerical model spatial resolution and the computation cost. It states: when the spatial resolution of model is finer, the result ...
3
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2answers
577 views

Can the dew point temperature be more than drybulb temperature?

I am extracting data from WRF model output for a specific area. The area I am extracting data for is 5000m above mean sea level. When plotting on a graph, I found that the dew point temperature is ...
2
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1answer
2k views

Calculate precipitation from WRF model output

From WRF output file, I find 3 variables related to the precipitation (unit: mm) 1. Precipitation variable name: pr unit:$kg/(m^{2}s^1)$ variable: RAINC+RAINNC comments: $dt(...
10
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2answers
660 views

Technique to delete spin-up frames from WRF

I'm a user of WRF V3.5 aiming at meteorological simulation. Sometimes, I'll run the model for a long period. My attempt I split the long period(e.g 1 year) into serval short ones. For ...
3
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0answers
2k views

How to convert eta level to pressure level in WRF model

I am working WRF outputl file and require to extract wind and temp values at 850 hPa, 700 hPa and 500 hPa pressure levels. As the WRF vertical coordinates are based on eta level, I am having trouble ...
3
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0answers
131 views

Downscaling global meteorology data

Can some one explain me the basics of downscaling (interpolate to a smaller cell) a global meteorology data to a local scale (2 km × 2 km). IF would be very thankful if you provide a link at least. is ...
5
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1answer
353 views

What is “focus point” in WRF-plots grid box? (python code)

has anyone used the python code from here (written by Geir Arne Waagbo) to plot skewT plot from WRF output? I've got a question regarding some of the functions used in the code found in ...
7
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1answer
641 views

WRF output grid is smaller than input definition

I am running some test forecasts using WRF 3.6.1. and am having some problems with my grids. Specifically, I am specifying a parent and nest domain each with 25 points for longitude and latitude (so ...
7
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2answers
261 views

The climatological variance of albedo, soil moisture in weather models

Looking at WRF currently but I am sure this applies to most weather models there is a file (specifically LANDUSE.TBL) that specifies USGS derived albedo, soil ...
12
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4answers
5k views

How to get cell indices from latitude and longitude in WRF model grids?

I am using Weather Research and Forecasting model WRF and the WRF Preprocessing System WPS and could not get a satisfying answer from wrfhelp. Can anyone guide me in transforming latitude and ...