[gradsusr] NAM 12km vs. NAM Conus Nest Wind Direction

[dan martin]

My ctl made made with g2ctl is different than what you have. I'm not having
any issues with the winds.


pdef 1799 1059 lccr 21.138000 -122.72 1 1 38.500000 38.500000 -97.5
3000.000000 3000.000000
xdef 2503 linear -134.096127 0.0292401642786411
ydef 1155 linear 21.140671 0.0272727272727273


On Thu, Mar 23, 2017 at 5:05 AM, Sam Wilson <sam at surfline.com> wrote:

> Hi all,
>
>
>
> After the recent upgrade of the high resolution NAM conus nest, the wind
> direction in the wind plots I make appears to be wrong.
>
>
>
> I also plot wind data from the NAM 12km data – below are the PDEF, XDEF,
> and YDEF lines from a NAM 12km ctl file and a NAM conus nest ctl file:
>
>
>
> NAM 12km:
>
>
>
> pdef 614 428 lccr 12.190000 226.541000 1 1 25.000000 25.000000 265.000000
> 12191 12191
>
> xdef 614 linear -133.459 0.113383763365335
>
> ydef 428 linear 12.190000 0.110827272727273
>
>
>
> NAM conus nest:
>
>
>
> pdef 1799 1059 lccr 21.138000 237.280000 1 1 38.500000 38.500000
> 262.500000 3000 3000
>
> xdef 1799 linear -122.72 0.0292401642786411
>
> ydef 1059 linear 21.138000 0.0272727272727273
>
>
>
> The NAM conus nest wind directions appear to be about 90 degrees offset
> from those of the NAM 12km.  I initially thought it may be an issue where
> one is using grid relative where another is using earth relative, but now
> I’m second guessing that – I ran wgrib2 on a single file from each with the
> -vector_dir option and both appear to show grid relative.. and as you can
> see above, both have “lccr” in the PDEF.
>
>
>
> What I’m after is being able to plot wind barbs in the meteorological
> convention from both and I’m curious why I’m getting different results
> between the above two datasets when plotting the same way.
>
>
>
> Many thanks!
>
>
>
> Sam Wilson
>
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