[Met_help] [rt.rap.ucar.edu #61312] History for multiple model data files

[John Halley Gotway via RT]

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  Initial Request
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Dear John,
 
How are you doing? It 's me again.
 
Is there any way to use multiple model data files (for different forecast hours) with the point_stat module?
I have an observation file (.nc) and a number of WRF output files after using UPP (WRFPRS_d01.** files)

Thanks a lot,

Dr Emmanouil George
PhD in Atmospheric Physics/Meteorology

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  Complete Ticket History
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Subject: Re: [rt.rap.ucar.edu #61312] multiple model data files
From: John Halley Gotway
Time: Thu May 09 10:00:10 2013

Dr Emmanouil George,

There is not a way to pass Point-Stat multiple model data files.
However, if you're working with the GRIB output of UPP, you can
literally 'cat' those files together to combine them.

For example:
    cat file1.grb file2.grb > files1_and_2.grb

If you choose to combine your GRIB files in this way, you could pass
that single combined file to Point-Stat.

While it is possible to do this, it makes the configuration file for
Point-Stat much messier.  Suppose for example, that you were
evaluating 2-meter temperature and 500mb geopotential height.  Your
config file might include the following:

    field = [
       {
         name         = "TMP";
         level        = [ "Z2" ];
         cat_thresh   = [ >273.15 ];
         message_type = [ "ADPSFC" ];
       },
       {
         name         = "HGT";
         level        = [ "P500" ];
         cat_thresh   = [ <1000 ];
         message_type = [ "ADPUPA" ];
       }
    ];

Now suppose, you want to evaluate a single model data file containing
3 lead times of 00, 12, and 24 hours.  You'd need to set up the config
file like this:

    field = [
       {
         name         = "TMP";
         level        = [ "Z2" ];
         cat_thresh   = [ >273.15 ];
         message_type = [ "ADPSFC" ];
         lead_time    = "00";
       },
       {
         name         = "HGT";
         level        = [ "P500" ];
         cat_thresh   = [ <1000 ];
         message_type = [ "ADPUPA" ];
         lead_time    = "00";
       },
       {
         name         = "TMP";
         level        = [ "Z2" ];
         cat_thresh   = [ >273.15 ];
         message_type = [ "ADPSFC" ];
         lead_time    = "12";
       },
       {
         name         = "HGT";
         level        = [ "P500" ];
         cat_thresh   = [ <1000 ];
         message_type = [ "ADPUPA" ];
         lead_time    = "12";
       },
       {
         name         = "TMP";
         level        = [ "Z2" ];
         cat_thresh   = [ >273.15 ];
         message_type = [ "ADPSFC" ];
         lead_time    = "24";
       },
       {
         name         = "HGT";
         level        = [ "P500" ];
         cat_thresh   = [ <1000 ];
         message_type = [ "ADPUPA" ];
         lead_time    = "24";
       }
    ];

Rather than listing just 2 fields to be evaluated, I had to list 6: 2
fields for each of 3 lead times.

Generally, I find it's easier to just keep data for each lead time in
a separate file, and then just call Point-Stat via a script that loops
through the lead times.

But it's up to you to proceed however you'd like.

Hope that helps.

Thanks,
John


On 05/09/2013 06:25 AM, George Emmanouil via RT wrote:
>
> Thu May 09 06:25:51 2013: Request 61312 was acted upon.
> Transaction: Ticket created by george.emmanouil at yahoo.gr
>         Queue: met_help
>       Subject: multiple model data files
>         Owner: Nobody
>    Requestors: george.emmanouil at yahoo.gr
>        Status: new
>   Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=61312 >
>
>
> Dear John,
>
> How are you doing? It 's me again.
>
> Is there any way to use multiple model data files (for different
forecast hours) with the point_stat module?
> I have an observation file (.nc) and a number of WRF output files
after using UPP (WRFPRS_d01.** files)
>
> Thanks a lot,
>
> Dr Emmanouil George
> PhD in Atmospheric Physics/Meteorology
>

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