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

[Nimrod Micael]

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
>>
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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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