Re: Fwd: wrf_map() doesn't put terrain in right place

Hi Don,

I remember this thread, but I'm afraid I don't remember where we left
it. (Or did we completely drop the ball on it?!)

Anyway, one thing I have seen occasionally is that the WRF data file
has the wrong center longitude value, and hence the map projection
and the data don't line up quite right. I'm not sure NCL can do anything
to detect this.

Can you provide a sample dataset and script for us to look at?

--Mary

On Thu, 10 Jul 2008, Don Morton wrote:

> Hi all,
>
> I decided to politely re-surface the following thread :) It seems like
> colleagues are running into this issue more and more, and I'm afraid I don't
> know enough to say much more than that for some reason the WRF domains
> aren't plotted correctly by a number of software packages, including the NCL
> WRF functions (and, we've learned recently, GEMPAK). Is there a way that we
> out here in the trenches might be wanting to define our original domains to
> avoid these problems?
>
> Thanks,
>
> Don
>
> ---------- Forwarded message ----------
> From: Don Morton <donaldjmorton_at_gmail.com>
> Date: Thu, May 1, 2008 at 10:16 PM
> Subject: wrf_map() doesn't put terrain in right place
> To: ncl forum <ncl-talk_at_ucar.edu>, wrfhelp <wrfhelp_at_ucar.edu>
>
>
> Hi, here's another problem I've been running into lately -
> it's very similar to one I had last summer, that you all helped
> me find a fix for.
>
> I'm trying to use the newer wrf NCL functions, as I really like
> their potential ease of use. However, in trying to do a simple
> terrain plot on a WRF nest, the terrain ends up in the wrong
> place. The script is available at
>
> <http://weather.arsc.edu/Miscellaneous/NCL/Maps/wrfHGT-1.ncl>
>
> and the input data, "wrfoutd02.nc" is in the same directory.
> The resulting image is at
>
> <http://weather.arsc.edu/Miscellaneous/NCL/Maps/Image1.jpg>
>
> You can see that the Alaska Range has moved to the Gulf of Alaska.
>
> This is presumably because the WRF output file represents an inner
> nest of a larger domain, and in this nest the Standard Lon and the
> Center Lon are different. This "seems" like a common occurrence to me,
> unless you place the nest smack in the middle of the parent?
>
> Last summer, you all helped me fix this issue, and such a
> script exists at
>
> <http://weather.arsc.edu/Miscellaneous/NCL/Maps/wrfHGT-2.ncl>
>
> with resulting image at
>
> <http://weather.arsc.edu/Miscellaneous/NCL/Maps/Image2.jpg>
>
> I tried playing around with some resource settings for the wrf_map()
> functions, but couldn't get anything to work.
>
> Thanks,
>
> Don
> --
> University of Montana
> http://www.cs.umt.edu/~morton/ <http://www.cs.umt.edu/%7Emorton/>
> Arctic Region Supercomputing Center
> http://weather.arsc.edu/
>
>
>
> --
> Arctic Region Supercomputing Center
> http://weather.arsc.edu/
> University of Montana
> http://www.cs.umt.edu/~morton/
>
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Received on Thu Jul 10 2008 - 15:57:02 MDT