[gradsusr] Question about srh1km(uVAR,vVAR) function

[Jeff Duda]

If you're calculating 0-1 km SRH over flat terrain near sea level, their
computation is within reason.  However, if you're on higher terrain or
sloped terrain (e.g., the Plains region of the US), you'll want to use a
different method.

Jeff


On Sat, Sep 7, 2013 at 11:28 AM, Nimrod Micael <nmicael at aggies.ncat.edu>wrote:

> He stated it's 1 KM MSL.
>
>
>
> "However, the question of AGL or MSL depends on your model data output -
> if it compensates the pressure height. GFS IIRC does not do that, so it
> would be MSL.
>
> To understand the calculation, you can check the original math from our
> website:
> http://www.saakeskus.fi/grads-scripts/63-storm-relative-helicity-0-3km"
>
> So in order to calculate 0-1 KM shear it has to be 0-1 KM AGL?
>
>
> Thanks.
>
>
>
>
> On Fri, Sep 6, 2013 at 1:30 PM, Jeff Duda <jeffduda319 at gmail.com> wrote:
>
>> I don't use openGrads, so there may be some specifics I'm not aware of.
>> uVAR and vVAR are just dummy names for the u- and v-components of the
>> wind.  The inaccuracies are probably due to the exact specifics with how
>> the 0-1 km shear is computed in the script.  One big question is how is the
>> 1 km layer wind field being computed?  Is it just 1 km MSL or 1 km AGL?
>> Those are things you need to find out.  I recommend asking the authors
>> whose email addresses are given on the linked page.
>>
>> Jeff
>>
>>
>> On Fri, Sep 6, 2013 at 12:20 PM, Nimrod Micael <nmicael at aggies.ncat.edu>wrote:
>>
>>> *srh1km*(*uVAR,vVAR*)
>>> What is uVAR and vVAR?  I dont have those variables.
>>>
>>> http://opengrads.org/doc/udxt/saakeskus/
>>>
>>> I tried replacing uVar and vVar with u and v wind but I am getting some
>>> inaccuracies with the 0-1 KM shear. Can someone help me out?
>>>
>>> Thanks.
>>>
>>> --
>>> Nimrod Micael
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
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>>>
>>>
>>
>>
>> --
>> Jeff Duda
>> Graduate research assistant
>> University of Oklahoma School of Meteorology
>> Center for Analysis and Prediction of Storms
>>
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>>
>>
>
>
> --
> Nimrod Micael
>
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>
>


-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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