[Met_help] stat_analysis and wind speed

[John Halley Gotway]

Phillip,

Good news.  You don't need to have WIND (wind speed) in your output GRIB files to verify it.  If you request that 2-meter wind speed, for example, be verified (WIND/Z2), MET will look in your GRIB
file for a wind speed record.  If it finds one, it'll use it.  If not, it'll look for the 2-meter U-component of wind and the 2-meter V-component of wind and derive wind speed for you.  The same is
true of your observations.  Wind speed is actually a lot easier to verify than wind direction.  Since wind speed is just a field of scalars, like TMP or DPT, we can just use the same methods used for
all other scalars.

It's wind direction that is more difficult.  It's a special case since it's a circular variable, and we have to be more careful how we handle it.

So MET will derive wind speed for you if you don't have it, but if you're running WRF output through the WRF Post-Processor, you could enable it's output of wind speed as well.

Hope that helps.

John Halley Gotway
johnhg at ucar.edu

Phillip Spencer wrote:
> Hi.
> 
> For the life of me, I can't figure out how to run stat_analysis to verify wind speed.
> 
> Our point_stat config file contains fcst_field[] = ["TMP/Z002", "DPT/Z002", "UGRD/Z010", "VGRD/Z010"].
> 
> I'm having no problems using stat_analysis on TMP and DPT and I used your documentation to use "-line_type VL1L2 -out_line_type WDIR" to verify the wind direction, but how to I verify wind speed? [I don't have variable WIND in my GRIB files--Do I need it?]
> 
> Do I use a "-job summary" or a "-job aggregate_stat" or something else? Do I use "line_type CNT"?
> 
> Would you please email a sample command line:
> 
>             stat_analysis -lookin ./ -out stat_analysis.out -dump_row dump_row.out [PLEASE HELP HERE...]
> 
> Thanks for your help.
> 
> Phillip Spencer
> Weather Decision Technologies, Inc.
> Norman, OK
> 
> 
> 
> 
> 
> 
> 
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