UPP and forecast_product for idealized experiments

Submitted by lwj on Wed, 06/16/2021 - 01:01
Forum: Users | Post-processing

Dear all,

 

I would like to extract TC radius and its size from the model outputs of idealized experiment.

I coudn't use UPP or forecast product because Information on TC ID, positions, etc in TCvitals should be needed.

Please let me know the method.

 

Best,

Woojeong Lee

 

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Submitted by biswas on Wed, 06/16/2021 - 10:51

Hi,

If I understand correctly you are trying to get the TC radius and other information from the HWRF Idealized experiments. For that you need to first run UPP on the model output. For that, you do not need TC ID or any TC information. Please refer to the UPP Users Guide for more information. Then you may want to run the GFDL vortex tracker to extract TC information from the post processed output. 

Please let me know if you run into issues. 

Thanks

Biswas

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Submitted by lwj on Wed, 06/23/2021 - 20:19

Thank you for your reply.

You are exactly understand my needs.

I downloaded UPP and standalone GFDL vortex tracker as you told me.

By the way, I have another problem.

The tcvit_rsmc_storms.txt file is needed to get fort.64 and fort.69 in standalone GFDL vortex tracker.

As you know, I am trying to extract idealized TC information by using GFDL vortex tracker.

How can I set the tcvit_rsmc_storms.txt ?

Thank you in advance.

Best,

Woojeong

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Submitted by biswas on Thu, 06/24/2021 - 10:33

Hi Woojeong,

I would modify an existing tcvitals (tcvit_rsmc_storms.txt) file. You have the storm.center and the initialization date and time. For the intensity and MSLP: try to plot the wind speed and MSLP from the GRIB files at the initial time and use the max wind speed at the surface and as the intensity. I haven't plotted the idealized run intensity for a while but I am interested to know how it goes. Few things to keep in mind regarding the input to GFDL tracker:

The data must be on a cylindrical equidistant, latitude-longitude (lat/lon) grid. While the dx and dy grid increments need to be uniform across the grid, dx does not need to be equal to dy. The data should be ordered so that j and i increment from north to south and east to west, respectively, such that point (1,1) is in the far northwestern part of the grid, and point (imax,jmax) is in the far southeastern part of the grid. Data files with values incrementing from south to north can be flipped prior to execution of the tracker using an external GRIB or NetCDF file manipulation tool.

Thanks

Biswas

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