[Met_help] [rt.rap.ucar.edu #46807] History for FW: "WIND" in obs field

[RAL HelpDesk {for John Halley Gotway}]

----------------------------------------------------------------
  Initial Request
----------------------------------------------------------------


John, when we place "WIND" in the obs field for MODE, the software gives us a syntax error.  "WIND" in the forecast field doesn't cause an error.  What is the proper way (syntax)  to get mode, for the obs field,  to take model analysis U/V components and generate a wind speed?

 

Thanks

 

Bob Craig



----------------------------------------------------------------
  Complete Ticket History
----------------------------------------------------------------

Subject: Re: [rt.rap.ucar.edu #46807] FW: "WIND" in obs field
From: John Halley Gotway
Time: Mon May 16 10:56:20 2011

Bob,

I'm not exactly sure what problem you're experiencing here.  To test
it out, I used some of the sample data that's distributed with MET and
ran MODE on windspeed.  Here's a couple of settings from my
MODE configuration file:
  fcst_field = "WIND/Z10";
  obs_field  = "WIND/Z10";

As you can see, I used MODE to compare 10-meter wind speed.  Wind
speed was not actually present in the GRIB file I passed to MODE - so
it used the corresponding U and V values and derived wind speed.
 And MODE ran fine on this data.

So MODE should be able to compare forecast wind speed to observed wind
speed in the way you'd expect.  Perhaps something else is going on
that's causing a problem.  If you continue to experience
problems running MODE on wind speed, please send me some sample data
to work with.  I'd need a forecast file, observation file, config
file, and the command line you're using to call MODE.

Thanks,
John Halley Gotway
met_help at ucar.edu

On 05/11/2011 11:34 AM, RAL HelpDesk {for Craig, Robert J Civ USAF
AFWA 16 WS/WXN} wrote:
>
> Wed May 11 11:34:10 2011: Request 46807 was acted upon.
> Transaction: Ticket created by Robert.Craig at offutt.af.mil
>        Queue: met_help
>      Subject: FW: "WIND" in obs field
>        Owner: Nobody
>   Requestors: Robert.Craig at offutt.af.mil
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=46807 >
>
>
>
> John, when we place "WIND" in the obs field for MODE, the software
gives us a syntax error.  "WIND" in the forecast field doesn't cause
an error.  What is the proper way (syntax)  to get mode, for the obs
field,  to take model analysis U/V components and generate a wind
speed?
>
>
>
> Thanks
>
>
>
> Bob Craig
>

------------------------------------------------
Subject: Re: [rt.rap.ucar.edu #46807] FW: "WIND" in obs field
From: John Halley Gotway
Time: Mon May 16 10:57:34 2011

Bob,

Forgot to send this response to your email address directly - so I'm
resending.

Thanks,
John

On 05/16/2011 10:56 AM, John Halley Gotway wrote:
> Bob,
>
> I'm not exactly sure what problem you're experiencing here.  To test
it out, I used some of the sample data that's distributed with MET and
ran MODE on windspeed.  Here's a couple of settings from my
> MODE configuration file:
>   fcst_field = "WIND/Z10";
>   obs_field  = "WIND/Z10";
>
> As you can see, I used MODE to compare 10-meter wind speed.  Wind
speed was not actually present in the GRIB file I passed to MODE - so
it used the corresponding U and V values and derived wind speed.
>  And MODE ran fine on this data.
>
> So MODE should be able to compare forecast wind speed to observed
wind speed in the way you'd expect.  Perhaps something else is going
on that's causing a problem.  If you continue to experience
> problems running MODE on wind speed, please send me some sample data
to work with.  I'd need a forecast file, observation file, config
file, and the command line you're using to call MODE.
>
> Thanks,
> John Halley Gotway
> met_help at ucar.edu
>
> On 05/11/2011 11:34 AM, RAL HelpDesk {for Craig, Robert J Civ USAF
AFWA 16 WS/WXN} wrote:
>>
>> Wed May 11 11:34:10 2011: Request 46807 was acted upon.
>> Transaction: Ticket created by Robert.Craig at offutt.af.mil
>>        Queue: met_help
>>      Subject: FW: "WIND" in obs field
>>        Owner: Nobody
>>   Requestors: Robert.Craig at offutt.af.mil
>>       Status: new
>>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=46807 >
>>
>>
>>
>> John, when we place "WIND" in the obs field for MODE, the software
gives us a syntax error.  "WIND" in the forecast field doesn't cause
an error.  What is the proper way (syntax)  to get mode, for the obs
field,  to take model analysis U/V components and generate a wind
speed?
>>
>>
>>
>> Thanks
>>
>>
>>
>> Bob Craig
>>

------------------------------------------------
Subject: Re: [rt.rap.ucar.edu #46807] FW: "WIND" in obs field
From: John Halley Gotway
Time: Thu Jun 02 09:12:07 2011

Bob,

Yes, that is exactly what's going on.  MODE is erroring out since the
grid definition parameters are not identical.  In the initial releases
of MET, we were only checking that the grid dimensions
matched, nx and ny.  But we found over the years that this masked some
minor differences in grid definitions that we were not aware of.  The
minor differences in your grid definitions are a perfect
example of that.  So in later releases, we added support for more
robust grid comparisons - checking all of the grid definition
parameters.

You can fix this problem by running one of your GRIB files through
copygb to regrid it to the other's grid.  An example of running copygb
on a lambert conformal grid can be found here:
  http://www.dtcenter.org/met/users/support/online_tutorial/METv3.0/copygb/run3.php

Hope that helps.

Thanks,
John

On 06/01/2011 01:41 PM, Craig, Robert J Civ USAF AFWA 16 WS/WXN wrote:
>       North Pole (342 x 210) Dx 15.000000 Dy 15.000000 scan 64 mode
8

------------------------------------------------