[ncl-talk] WRF Cross-section Plot - Terrain Depiction and Lowest Level Data Contours

Sun Jan 21 02:43:34 MST 2018

Scott:

I have attached two programs.

The second simply maps the cross-section on a horizontal map, so you can
see what line/cross-section you've chosen.

I separated this program from the one that makes vertical cross-sections
because I didn't want to mix horizontal and vertical cross-section maps in
the same output.

The first creates the cross section within specified lat/lon and vertical
heights using wrf-zoom, for instance.

It is set up for non-standard radar output, but you can make any
cross-sections of WRF output that you want.  It only makes one direction at
a time (you would have to choose a different IP values in the loop).

Barry

On Sun, Jan 21, 2018 at 8:42 AM, Barry Lynn <barry.h.lynn at gmail.com> wrote:

>
> ---------- Forwarded message ----------
> From: Scott Capps <scapps at atmosdatasolutions.com>
> Date: Fri, Jan 19, 2018 at 5:12 PM
> Subject: Re: [ncl-talk] WRF Cross-section Plot - Terrain Depiction and
> Lowest Level Data Contours
> To: Barry Lynn <barry.h.lynn at gmail.com>
> Cc: Bill Ladwig <ladwig at ucar.edu>, NCL <ncl-talk at ucar.edu>
>
>
> I modify the placement and width by passing in the lat/lon of the two
> points.  I would be interested in viewing your code and can send mine as
> well.
>
> On Fri, Jan 19, 2018 at 4:22 AM, Barry Lynn <barry.h.lynn at gmail.com>
> wrote:
>
>> Hi Scott:
>>
>> I am curious if you are able to set the cross section to appear where you
>> want it, or if you are able to modify the width (cross-sectional extent)?
>>
>> If not, I can send you my cross-section code that does all that.
>>
>> Barry Lynn
>>
>> On Fri, Jan 19, 2018 at 1:55 AM, Bill Ladwig via ncl-talk <
>> ncl-talk at ucar.edu> wrote:
>>
>>> Hi Scott,
>>>
>>> My first guess is that the vertical levels for interpolation are too
>>> large (not your fault). The interpolation algorithm automatically chooses
>>> vertical levels at .01*z_max. In your case z_max is 20251.8 m, which means
>>> your interpolation levels are at 202.5 m per grid box. This is probably too
>>> large for what you're interested in looking at.
>>>
>>> As a first attempt to fix, let's edit your WRFUserARW.ncl.
>>>
>>> At line 383, change this:
>>>
>>> dz = 0.01 * z_max
>>>>
>>>
>>> to this:
>>>
>>> dz = 0.0025 * z_max
>>>
>>>
>>> If this doesn't help your situation, I'll need to dig in to this a bit
>>> more.
>>>
>>> Hope this helps,
>>>
>>> Bill
>>>
>>> On Thu, Jan 18, 2018 at 3:04 PM, Scott Capps via ncl-talk <
>>> ncl-talk at ucar.edu> wrote:
>>>
>>>> Greetings,
>>>>
>>>> I have some questions about the cross-section plots from WRF output.  I
>>>> basically started from the example scripts at:
>>>> http://www2.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NC
>>>> L/Examples/CROSS_SECTION/wrf_CrossSection_smooth4.htm
>>>>
>>>> The whitespace along the terrain height is much too large and the
>>>> terrain is too coarse (this is a 667m resolution WRF run) or the lowest
>>>> level atmospheric data is not being contoured correctly.  The cross-section
>>>> plotting routine in GRaDs seems to show true the resolution of terrain and
>>>> terrain following data.  Is there a way to improve this in NCL?
>>>>
>>>> I have attached some code (cross_sxn_plot_test.ncl and modified
>>>> WRFUserARW.ncl) and have ftp'd an example wrfout file to the incoming
>>>> directory as:  wrfout_d05_2017-10-09_00:00:00.nc
>>>>
>>>>
>>>> NCL v6.3.0
>>>> http://www2.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NCL/Exa
>>>> mples/CROSS_SECTION/wrf_CrossSection_smooth4.htm
>>>>
>>>> --
>>>> *Scott Capps*
>>>> Principal
>>>> Atmospheric Data Solutions <http://www.atmosphericdatasolutions.com>
>>>> scapps at atmosdatasolutions.com
>>>> cell: (949) 910-4385
>>>>
>>>>
>>>> _______________________________________________
>>>> ncl-talk mailing list
>>>> ncl-talk at ucar.edu
>>>> List instructions, subscriber options, unsubscribe:
>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>
>>>>
>>>
>>> _______________________________________________
>>> ncl-talk mailing list
>>> ncl-talk at ucar.edu
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>>
>>
>>
>> --
>> Barry H. Lynn, Ph.D
>> Senior Lecturer,
>> The Institute of the Earth Science,
>> The Hebrew University of Jerusalem,
>> Givat Ram, Jerusalem 91904, Israel
>> Tel: 972 547 231 170
>> Fax: (972)-25662581
>>
>> C.E.O, Weather It Is, LTD
>> Weather and Climate Focus
>> http://weather-it-is.com
>> Jerusalem, Israel
>> Local: 02 930 9525
>> Cell: 054 7 231 170
>> Int-IS: x972 2 930 9525
>> US 914 432 3108 <(914)%20432-3108>
>>
>
>
>
> --
> *Scott Capps*
> Principal
> Atmospheric Data Solutions <http://www.atmosphericdatasolutions.com>
> scapps at atmosdatasolutions.com
> cell: (949) 910-4385
>
>
>
>
> --
> Barry H. Lynn, Ph.D
> Senior Lecturer,
> The Institute of the Earth Science,
> The Hebrew University of Jerusalem,
> Givat Ram, Jerusalem 91904, Israel
> Tel: 972 547 231 170
> Fax: (972)-25662581
>
> C.E.O, Weather It Is, LTD
> Weather and Climate Focus
> http://weather-it-is.com
> Jerusalem, Israel
> Local: 02 930 9525
> Cell: 054 7 231 170
> Int-IS: x972 2 930 9525
> US 914 432 3108 <(914)%20432-3108>
>

-- 
Barry H. Lynn, Ph.D
Senior Lecturer,
The Institute of the Earth Science,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
US 914 432 3108
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20180121/c63a8904/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: wrf_vert_panels_radar_temp_gsn_b.ncl
Type: application/octet-stream
Size: 26591 bytes
Desc: not available
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20180121/c63a8904/attachment.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: wrf_maps_w_ang_line.ncl
Type: application/octet-stream
Size: 6347 bytes
Desc: not available
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20180121/c63a8904/attachment-0001.obj>