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Francis Rodrigo

New member
Hello and Good Day!,

I would like to ask if where should the namelist.ARWpost be linked to? My output data which is the wrfout_do* is in the em_real directory


New member
WRF-ARWpost is not a standalone term or concept, but it seems like you might be referring to the WRF (Weather Research and Forecasting) model along with its post-processing component called ARWpost.

1. **WRF (Weather Research and Forecasting):** WRF is a numerical atmospheric simulation system designed for both research and operational forecasting purposes. It is developed and maintained by a collaborative effort involving several research institutions and organizations. WRF is capable of simulating a wide range of atmospheric phenomena, including weather patterns, storms, and climate conditions. It's widely used by meteorologists and atmospheric scientists to study and predict weather and atmospheric processes.

2. **ARWpost:** ARWpost is a post-processing tool specifically designed for the Advanced Research WRF (ARW) model, which is one of the dynamic cores available within the WRF system. ARWpost is used to convert the model's output files (usually in NetCDF format) into more usable and visually appealing formats, such as graphical images or plots. It can generate various types of meteorological fields, such as temperature, pressure, wind speed, precipitation, etc., from the WRF model's output data. These fields are often used for analysis and visualization to better understand the simulated atmospheric conditions.

In summary, the term "WRF-ARWpost" likely refers to the combination of the WRF model's ARW dynamic core and the post-processing tool ARWpost, which is used to convert WRF model output data into visual representations for analysis and interpretation.receiptify

Ming Chen

Staff member
You can specify the path and file names in namelist.ARWpost (&io). Below is an examples:

input_root_name = '/user/home/wrfout/wrfout_d01_2000-01-24_12:00:00'
output_root_name = './test'
fields = 'height,pressure,tk,tc'

Hope this is helpful.


New member
WRF-ARWpost is a component of the Weather Research and Forecasting (WRF) modeling system, specifically designed to handle post-processing and visualization tasks for atmospheric and weather data generated by the Advanced Research WRF (ARW) core of the WRF model. The WRF model is a widely used numerical weather prediction system employed by meteorologists and researchers to simulate and forecast atmospheric processes and weather conditions.

ARWpost is responsible for taking the raw output data produced by the WRF-ARW model and converting it into more user-friendly formats for analysis and visualization. It performs several essential functions, including:

1. Gridding: ARWpost can interpolate model output onto various grid types and projections, such as regular latitude-longitude grids, Lambert conformal, Mercator, and more. This flexibility allows users to tailor the output to their specific needs.

2. Variable Extraction: It enables users to extract specific meteorological variables (e.g., temperature, precipitation, wind speed) from the model output for further analysis.

3. Vertical Interpolation: ARWpost can perform vertical interpolation to convert model data from model vertical levels to pressure levels or isobaric levels, making it easier to compare with observations or other datasets.

4. Format Conversion: The tool can convert model output from the WRF-specific NetCDF format into more common file formats like GRIB or ASCII, making it easier to work with various software and tools.

5. Plotting and Visualization: ARWpost can generate various types of plots and visualizations, including contour plots, streamline plots, and more, to help users better understand the model output. eubsetting: It allows users to subset the model output to specific time periods, geographic regions, or vertical levels of interest, reducing the size of the data for more efficient analysis.

ARWpost is a command-line tool, and users typically customize its settings through configuration files to specify the desired post-processing operations. It plays a crucial role in the overall workflow of using the WRF model, as it bridges the gap between the raw model output and the data needed for scientific analysis, research, and operational forecasting. cfa.home

olivia taylor

New member
Hello and Good Day!

To link the namelist.ARWpost file, which is typically used for configuring the Advanced Research Weather Research and Forecasting (ARW-WRF) model's post-processing settings, you should specify the path to this file in your ARW-WRF run script or configuration files.

Based on your description, if your output data files (wrfout_do*) are located in the em_real directory, you should ensure that the namelist.ARWpost file is also located in the same directory or specify the full path to the namelist.ARWpost file in your configuration.

Here's an example of how you might include this information in a human-readable response:

In order to link the namelist.ARWpost file to your ARW-WRF post-processing, you should make sure that the namelist.ARWpost file is located in the same directory as your output data (wrfout_do*) files, which, in this case, is the em_real directory. If the namelist.ARWpost file is located in a different directory, you will need to specify the full path to the namelist.ARWpost file in your ARW-WRF configuration. This configuration will ensure that your post-processing settings are correctly applied to the output data.

Additionally, if you have any questions or need further assistance with this process, feel free to ask. Receiptify Spotify

Ming Chen

Staff member
ARWpost is an obsolete postproces package for WRF. Development has been stopped years ago,
Python and NCAR NCL have been widely applied for analysis and visualization of WRF data in recent yers.


New member
WRF-ARWpost is a part of the larger WRF model suite used for weather prediction. The WRF model's Advanced Research and Forecasting (ARW) component uses it for post-processing and analysis. The Atmosphere Research Workstation (ARW) core is one of the two primary dynamic cores of the Weather Research and Forecasting (WRF) model.

ARWpost was developed to process the ARW core's output files. Researchers and meteorologists may now process, analyse, and visualise the model output in a more accessible and flexible way. Extracting useful data from model simulations relies heavily on this post-processing stage.

ARWpost is used for several purposes, and some of them are:

One of its primary features is the ability to **convert output formats** from the native WRF output format (NetCDF) to other forms, such as GRIB or ASCII, that are more widely used for analysis or visualisation.

To facilitate further research and visualisation, the model supports **Horizontal Interpolation**, a process that converts data from the model's original grid to a standard latitude-longitude grid.

ARWpost's third feature, **Vertical Interpolation**, allows users to analyse atmospheric variables at granular heights by interpolating model data to a variety of vertical levels.

The fourth feature, "Creating Plots and Graphics," includes a set of tools for making contour plots, vector plots, and other visual representations of the model's results.

Fifthly, users can pick and choose which meteorological variables are of interest to them and then extract those variables from the model's output to analyse further.

**Averaging and Aggregation**, Number Six: ARWpost can average the model's output both spatially and temporally to produce climatological statistics or to compile longer-term summaries.

In addition to the raw model output, it is also capable of computing derived variables. Wind speed, temperature advection, and other similar values are just some of the calculations that can be performed.

Eighth, **Quality Control**: It might have equipment for finding and fixing mistakes and inconsistencies in the model's output.

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New member
WRF's ARWpost postprocessing package has since become deprecated. Python and NCAR NCL have both seen widespread use in recent years for the purpose of analyzing and visualizing WRF data, however development of the software was halted years ago. KMFUSA