[ncl-talk] RUC2-Analysis Data Incorrectly Interpolated to Surface

[Michelle Serino]

Hi Dennis,

Thank you for getting back to me; your advice helped!  I am now trying to
adapt your advice to a separate script I have for the 25-km RUC2-Analysis,
and I receive the error:

fatal:Le: Number of dimensions do not match, can't continue

fatal:["Execute.c":8575]:Execute: Error occurred at or near line 97 in file
sounding25.ncl


I did my best to make sure that I converted the variable names to those of
the 25-km format and that I didn't make any other simple mistakes.  I could
easily have overlooked something, though.  Again, my script is attached,
and the direct link to the 25-km data is below. Thank you for your
continued help!


https://www.dropbox.com/s/fhq2s4o8vp0yiol/ruc2anl_252_20090605_1200_000.grb?dl=0


Best regards,


Michelle Serino

Michelle Serino
M.S. Candidate
Texas A&M University
Atmospheric Sciences Dept.
Eller O&M, Suite 1017
College Station, TX 77843
(484) 769-0949

On Thu, Jan 28, 2016 at 8:45 PM, Dennis Shea <shea at ucar.edu> wrote:

> A key is  the 'level_type' attribute associated with the pressure
> variables (PRES_). There are numerous PRES_ variables. In particular,
>
>       float PRES_P0_L1_GLC0 ( ygrid_0, xgrid_0 )
>          center :       US National Weather Service - NCEP (WMC)
>          production_status :    Operational products
>          long_name :    Pressure
>          units :        Pa
>          _FillValue :   1e+20
>          coordinates :  gridlat_0 gridlon_0
>          grid_type :    Lambert Conformal can be secant or tangent,
> conical or bipolar
>          parameter_discipline_and_category :    Meteorological products,
> Mass
>          parameter_template_discipline_category_number :        ( 0, 0, 3,
> 0 )
>          level_type :   Ground or water surface
> <*******************************************
>          level :         0
>          forecast_time :        0
>          forecast_time_units :  hours
>          initial_time : 06/05/2009 (12:00)
>
> It is a guess that this is the surface pressure (psfc). All pressure
> levels > psfc must be extrapolated. [ *Extrapolation is always dangerous!]
>
> The 'ind' function can be used to get all 'valid' levels [ p<psfc ]. Try
> attached.
>
> Cheers
>
>
> On Thu, Jan 28, 2016 at 11:47 AM, Michelle Serino <mmserino at tamu.edu>
> wrote:
>
>> Good afternoon,
>>
>> I am plotting RUC2-Analysis data on a skew-T.  Because this is analysis
>> data, it seems that the data are always interpolated to the 1000-mb
>> surface, regardless of the chosen location.  For example, in a high
>> elevation location like Denver, the data extend down to 1000 mb, which is
>> unrealistic.  This creates incorrect surface values, which results in a
>> very incorrect value of surface CAPE.
>>
>> I am wondering if, while still plotting on a skew-T, there is a way to
>> specify the data that is plotted.  Or, if there is another, more realistic,
>> way around this.  With a real sounding, I would not have this problem, so I
>> am sure there is a way to fix this for the analysis data.  I have attached
>> the script I am using, along with its plot and an observed sounding for the
>> same location (Denver).  The direct link to the analysis data I am using is
>> provided below.  I appreciate any help!
>>
>>
>> https://www.dropbox.com/s/qpe96hmhh9hsi0h/ruc2anl_130_20090605_1200_000.grb2?dl=0
>>
>> Best regards,
>>
>> Michelle Serino
>>
>> Michelle Serino
>> M.S. Candidate
>> Texas A&M University
>> Atmospheric Sciences Dept.
>> Eller O&M, Suite 1017
>> College Station, TX 77843
>> (484) 769-0949
>>
>> _______________________________________________
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>>
>>
>
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